12x-21=63

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Solution for 12x-21=63 equation: 



12x-21=63

We move all terms to the left:

12x-21-(63)=0

We add all the numbers together, and all the variables

12x-84=0

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

12x=84

x=84/12

x=7

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