(3x-4)-(2x-2)=21

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Solution for (3x-4)-(2x-2)=21 equation: 



(3x-4)-(2x-2)=21

We move all terms to the left:

(3x-4)-(2x-2)-(21)=0

We get rid of parentheses

3x-2x-4+2-21=0

We add all the numbers together, and all the variables

x-23=0

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

x=23

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