7x-(-3x)=-40

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Solution for 7x-(-3x)=-40 equation: 



7x-(-3x)=-40

We move all terms to the left:

7x-(-3x)-(-40)=0

We add all the numbers together, and all the variables

7x-(-3x)+40=0

We get rid of parentheses

7x+3x+40=0

We add all the numbers together, and all the variables

10x+40=0

We move all terms containing x to the left, all other terms to the right

10x=-40

x=-40/10

x=-4

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