8-7x-8=-21

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Solution for 8-7x-8=-21 equation: 



8-7x-8=-21

We move all terms to the left:

8-7x-8-(-21)=0

We add all the numbers together, and all the variables

-7x+21=0

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

-7x=-21

x=-21/-7

x=+3

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