x+7-3x=-21

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



x+7-3x=-21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-2x+28=0

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

-2x=-28

x=-28/-2

x=+14

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