7x+31+(-4x)-18=40

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Solution for 7x+31+(-4x)-18=40 equation: 



7x+31+(-4x)-18=40

We move all terms to the left:

7x+31+(-4x)-18-(40)=0

We add all the numbers together, and all the variables

7x+(-4x)-27=0

We get rid of parentheses

7x-4x-27=0

We add all the numbers together, and all the variables

3x-27=0

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

3x=27

x=27/3

x=9

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