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(4n-2)+(3n+8)+90=180
We move all terms to the left:
(4n-2)+(3n+8)+90-(180)=0
We add all the numbers together, and all the variables
(4n-2)+(3n+8)-90=0
We get rid of parentheses
4n+3n-2+8-90=0
We add all the numbers together, and all the variables
7n-84=0
We move all terms containing n to the left, all other terms to the right
7n=84
n=84/7
n=12
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