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18=7x-42
We move all terms to the left:
18-(7x-42)=0
We get rid of parentheses
-7x+42+18=0
We add all the numbers together, and all the variables
-7x+60=0
We move all terms containing x to the left, all other terms to the right
-7x=-60
x=-60/-7
x=8+4/7
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