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(5x+45)=87
We move all terms to the left:
(5x+45)-(87)=0
We get rid of parentheses
5x+45-87=0
We add all the numbers together, and all the variables
5x-42=0
We move all terms containing x to the left, all other terms to the right
5x=42
x=42/5
x=8+2/5
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