-4x+7x=-21

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Solution for -4x+7x=-21 equation: 



-4x+7x=-21

We move all terms to the left:

-4x+7x-(-21)=0

We add all the numbers together, and all the variables

3x+21=0

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

3x=-21

x=-21/3

x=-7

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