21=6x-12

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Solution for 21=6x-12 equation: 



21=6x-12

We move all terms to the left:

21-(6x-12)=0

We get rid of parentheses

-6x+12+21=0

We add all the numbers together, and all the variables

-6x+33=0

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

-6x=-33

x=-33/-6

x=5+1/2

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