demo-2-5.js

"use strict";

var num1;
var num2;
var num3;
var answer1;

num1 = 15;
num2 = -10;

num3 = 7;


var num5 = 128;

///num4 = 42;

answer1 = num2 / 2;

console.log(answer1);

console.log(-answer1);

console.log(answer1);

answer1 = -answer1;

console.log(answer1);