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(x-180)+(x-180)+90=180
We move all terms to the left:
(x-180)+(x-180)+90-(180)=0
We add all the numbers together, and all the variables
(x-180)+(x-180)-90=0
We get rid of parentheses
x+x-180-180-90=0
We add all the numbers together, and all the variables
2x-450=0
We move all terms containing x to the left, all other terms to the right
2x=450
x=450/2
x=225
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