-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+28=0

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

-4x=-28

x=-28/-4

x=+7

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