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(5x+3)=78
We move all terms to the left:
(5x+3)-(78)=0
We get rid of parentheses
5x+3-78=0
We add all the numbers together, and all the variables
5x-75=0
We move all terms containing x to the left, all other terms to the right
5x=75
x=75/5
x=15
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