9-2(x+7)=21

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Solution for 9-2(x+7)=21 equation: 



9-2(x+7)=21

We move all terms to the left:

9-2(x+7)-(21)=0

We add all the numbers together, and all the variables

-2(x+7)-12=0

We multiply parentheses

-2x-14-12=0

We add all the numbers together, and all the variables

-2x-26=0

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

-2x=26

x=26/-2

x=-13

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