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180=(x+12)+x+(x-9)
We move all terms to the left:
180-((x+12)+x+(x-9))=0
We calculate terms in parentheses: -((x+12)+x+(x-9)), so:We get rid of parentheses
(x+12)+x+(x-9)
We add all the numbers together, and all the variables
x+(x+12)+(x-9)
We get rid of parentheses
x+x+x+12-9
We add all the numbers together, and all the variables
3x+3
Back to the equation:
-(3x+3)
-3x-3+180=0
We add all the numbers together, and all the variables
-3x+177=0
We move all terms containing x to the left, all other terms to the right
-3x=-177
x=-177/-3
x=+59
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