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(180-4x)+90+(90-x)=180
We move all terms to the left:
(180-4x)+90+(90-x)-(180)=0
We add all the numbers together, and all the variables
(-4x+180)+(-1x+90)+90-180=0
We add all the numbers together, and all the variables
(-4x+180)+(-1x+90)-90=0
We get rid of parentheses
-4x-1x+180+90-90=0
We add all the numbers together, and all the variables
-5x+180=0
We move all terms containing x to the left, all other terms to the right
-5x=-180
x=-180/-5
x=+36
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