12+3x-x-12=20

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Solution for 12+3x-x-12=20 equation: 



12+3x-x-12=20

We move all terms to the left:

12+3x-x-12-(20)=0

We add all the numbers together, and all the variables

2x-20=0

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

2x=20

x=20/2

x=10

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