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 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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