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180-x/2=12-2(90-x)
We move all terms to the left:
180-x/2-(12-2(90-x))=0
We add all the numbers together, and all the variables
-x/2-(12-2(-1x+90))+180=0
We multiply all the terms by the denominator
-x-((12-2(-1x+90)))*2+180*2=0
We add all the numbers together, and all the variables
-1x-((12-2(-1x+90)))*2+360=0
We move all terms containing x to the left, all other terms to the right
-1x-((12-2(-1x+90)))*2=-360
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