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12+3x=1.5x+42
We move all terms to the left:
12+3x-(1.5x+42)=0
We get rid of parentheses
3x-1.5x-42+12=0
We add all the numbers together, and all the variables
1.5x-30=0
We move all terms containing x to the left, all other terms to the right
1.5x=30
x=30/1.5
x=20
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