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90+(4x-7)+(2x+13)=180
We move all terms to the left:
90+(4x-7)+(2x+13)-(180)=0
We add all the numbers together, and all the variables
(4x-7)+(2x+13)-90=0
We get rid of parentheses
4x+2x-7+13-90=0
We add all the numbers together, and all the variables
6x-84=0
We move all terms containing x to the left, all other terms to the right
6x=84
x=84/6
x=14
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