javascript - How do I display a number before the equations? -

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how modify code when equations printed, number displayed before them. example,

2x+1=12

-x+2=5

this code needed modify.

function getrandomnumber(min, max, notthese) {    num = min + math.floor((max - min + 1) * math.random());    return (num);  }    function getoption(s, ch, num) {    var = s.split(ch)    return a[num - 1];  }    function getequation() {    var num1 = getrandomnumber(20, -20, "");    var num2 = getrandomnumber(20, -20, "");    var num3 = getrandomnumber(20, -20, "");    var num4 = getrandomnumber(20, -20, "");    var letter = getoption("x,y,z,w", ",", getrandomnumber(1, 4));      var str = "" + num1 + "" + letter + "+" + num2 + "=" + num3 + "" + letter + "+" + num4 + ""    var total = (num4 - num2) / (num1 - num3);    return (str + " (" + total + ")");    }    (var = 1; <= 20; i++)      {      document.write(getequation() + "<br>")    }

add iterator i document.write(getequation()+"<br>")

function getrandomnumber(min, max, notthese) {    num = min + math.floor((max - min + 1) * math.random());    return (num);  }  function getoption(s, ch, num) {    var = s.split(ch)    return a[num - 1];  }  function getequation() {    var num1 = getrandomnumber(20, -20, "");    var num2 = getrandomnumber(20, -20, "");    var num3 = getrandomnumber(20, -20, "");    var num4 = getrandomnumber(20, -20, "");    var letter = getoption("x,y,z,w", ",", getrandomnumber(1, 4));    var str = "" + num1 + "" + letter + "+" + num2 + "=" + num3 + "" + letter + "+" + num4 + ""    var total = (num4 - num2) / (num1 - num3);    return (str + " (" + total + ")");  }  (var = 1; <= 20; i++) {    document.write("<span>" + + ": </span>" + getequation() + "<br />")  }
body {    font: 12px arial;  }  span {    color: red  }


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