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180-(3x+12)=2x+3x
We move all terms to the left:
180-(3x+12)-(2x+3x)=0
We add all the numbers together, and all the variables
-(3x+12)-(+5x)+180=0
We get rid of parentheses
-3x-5x-12+180=0
We add all the numbers together, and all the variables
-8x+168=0
We move all terms containing x to the left, all other terms to the right
-8x=-168
x=-168/-8
x=+21
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