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180=x+(x-12)+(x+30)
We move all terms to the left:
180-(x+(x-12)+(x+30))=0
We calculate terms in parentheses: -(x+(x-12)+(x+30)), so:We get rid of parentheses
x+(x-12)+(x+30)
We get rid of parentheses
x+x+x-12+30
We add all the numbers together, and all the variables
3x+18
Back to the equation:
-(3x+18)
-3x-18+180=0
We add all the numbers together, and all the variables
-3x+162=0
We move all terms containing x to the left, all other terms to the right
-3x=-162
x=-162/-3
x=+54
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