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(5x+3)=42
We move all terms to the left:
(5x+3)-(42)=0
We get rid of parentheses
5x+3-42=0
We add all the numbers together, and all the variables
5x-39=0
We move all terms containing x to the left, all other terms to the right
5x=39
x=39/5
x=7+4/5
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