12-7x-8=-21

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Solution for 12-7x-8=-21 equation: 



12-7x-8=-21

We move all terms to the left:

12-7x-8-(-21)=0

We add all the numbers together, and all the variables

-7x+25=0

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

-7x=-25

x=-25/-7

x=3+4/7

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