12-3x=8x-21

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



12-3x=8x-21

We move all terms to the left:

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

-11x+33=0

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

-11x=-33

x=-33/-11

x=+3

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