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(5x-4)-(2x+31)+90=180
We move all terms to the left:
(5x-4)-(2x+31)+90-(180)=0
We add all the numbers together, and all the variables
(5x-4)-(2x+31)-90=0
We get rid of parentheses
5x-2x-4-31-90=0
We add all the numbers together, and all the variables
3x-125=0
We move all terms containing x to the left, all other terms to the right
3x=125
x=125/3
x=41+2/3
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