-3(-x+7)=5x+-21

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Solution for -3(-x+7)=5x+-21 equation: 



-3(-x+7)=5x+-21

We move all terms to the left:

-3(-x+7)-(5x+-21)=0

We add all the numbers together, and all the variables

-3(-1x+7)-(5x-21)=0

We multiply parentheses

3x-(5x-21)-21=0

We get rid of parentheses

3x-5x+21-21=0

We add all the numbers together, and all the variables

-2x=0

x=0/-2

x=0

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