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180=10x+11x+12
We move all terms to the left:
180-(10x+11x+12)=0
We add all the numbers together, and all the variables
-(21x+12)+180=0
We get rid of parentheses
-21x-12+180=0
We add all the numbers together, and all the variables
-21x+168=0
We move all terms containing x to the left, all other terms to the right
-21x=-168
x=-168/-21
x=+8
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