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12=3x+42
We move all terms to the left:
12-(3x+42)=0
We get rid of parentheses
-3x-42+12=0
We add all the numbers together, and all the variables
-3x-30=0
We move all terms containing x to the left, all other terms to the right
-3x=30
x=30/-3
x=-10
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