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42=9x-12
We move all terms to the left:
42-(9x-12)=0
We get rid of parentheses
-9x+12+42=0
We add all the numbers together, and all the variables
-9x+54=0
We move all terms containing x to the left, all other terms to the right
-9x=-54
x=-54/-9
x=+6
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