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(2x+31)+(4x-19)+90=180
We move all terms to the left:
(2x+31)+(4x-19)+90-(180)=0
We add all the numbers together, and all the variables
(2x+31)+(4x-19)-90=0
We get rid of parentheses
2x+4x+31-19-90=0
We add all the numbers together, and all the variables
6x-78=0
We move all terms containing x to the left, all other terms to the right
6x=78
x=78/6
x=13
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