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30+x+12=3x+2
We move all terms to the left:
30+x+12-(3x+2)=0
We add all the numbers together, and all the variables
x-(3x+2)+42=0
We get rid of parentheses
x-3x-2+42=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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