-3x+7-x=21

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Solution for -3x+7-x=21 equation: 



-3x+7-x=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-4x-14=0

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

-4x=14

x=14/-4

x=-3+1/2

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