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(5x-12)=42
We move all terms to the left:
(5x-12)-(42)=0
We get rid of parentheses
5x-12-42=0
We add all the numbers together, and all the variables
5x-54=0
We move all terms containing x to the left, all other terms to the right
5x=54
x=54/5
x=10+4/5
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