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77+(5x+3)=180
We move all terms to the left:
77+(5x+3)-(180)=0
We add all the numbers together, and all the variables
(5x+3)-103=0
We get rid of parentheses
5x+3-103=0
We add all the numbers together, and all the variables
5x-100=0
We move all terms containing x to the left, all other terms to the right
5x=100
x=100/5
x=20
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