First, you can rewrite the equation as 5x-10x=-100. You need to do this so that you can carry “x” to one side in order to solve it. Thus, 100 becomes -100 because you’re carrying it to the other side. Then, you subtract. 5x-10x is -5x. Now your equation is -5x=-100. Divide both sides by -5, so that you remove the negative and the coefficient. -100/-5 is 20. This, x is equivalent to 20. You can check your work by substituting the value 20, instead of “x”.
