-7x+7+5x=21

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Solution for -7x+7+5x=21 equation: 



-7x+7+5x=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-2x-14=0

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

-2x=14

x=14/-2

x=-7

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