3x-8=21x+12

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Solution for 3x-8=21x+12 equation: 



3x-8=21x+12

We move all terms to the left:

3x-8-(21x+12)=0

We get rid of parentheses

3x-21x-12-8=0

We add all the numbers together, and all the variables

-18x-20=0

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

-18x=20

x=20/-18

x=-1+1/9

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