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(7x+3)+90=180
We move all terms to the left:
(7x+3)+90-(180)=0
We add all the numbers together, and all the variables
(7x+3)-90=0
We get rid of parentheses
7x+3-90=0
We add all the numbers together, and all the variables
7x-87=0
We move all terms containing x to the left, all other terms to the right
7x=87
x=87/7
x=12+3/7
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