12x+3+7x-x=21x

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Solution for 12x+3+7x-x=21x equation: 



12x+3+7x-x=21x

We move all terms to the left:

12x+3+7x-x-(21x)=0

We add all the numbers together, and all the variables

-3x+3=0

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

-3x=-3

x=-3/-3

x=1

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