(x-7)-(3x+2)=x+21

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Solution for (x-7)-(3x+2)=x+21 equation: 



(x-7)-(3x+2)=x+21

We move all terms to the left:

(x-7)-(3x+2)-(x+21)=0

We get rid of parentheses

x-3x-x-7-2-21=0

We add all the numbers together, and all the variables

-3x-30=0

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

-3x=30

x=30/-3

x=-10

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