3x+12+7x+21=21

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



3x+12+7x+21=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

10x+12=0

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

10x=-12

x=-12/10

x=-1+1/5

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