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3x-12=x+28
We move all terms to the left:
3x-12-(x+28)=0
We get rid of parentheses
3x-x-28-12=0
We add all the numbers together, and all the variables
2x-40=0
We move all terms containing x to the left, all other terms to the right
2x=40
x=40/2
x=20
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