x+21=12x-12

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



x+21=12x-12

We move all terms to the left:

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

We get rid of parentheses

x-12x+12+21=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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