12+7x-3=21

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



12+7x-3=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

7x-12=0

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

7x=12

x=12/7

x=1+5/7

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