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180=(2x+45)+(3x+60)+40
We move all terms to the left:
180-((2x+45)+(3x+60)+40)=0
We calculate terms in parentheses: -((2x+45)+(3x+60)+40), so:We get rid of parentheses
(2x+45)+(3x+60)+40
We get rid of parentheses
2x+3x+45+60+40
We add all the numbers together, and all the variables
5x+145
Back to the equation:
-(5x+145)
-5x-145+180=0
We add all the numbers together, and all the variables
-5x+35=0
We move all terms containing x to the left, all other terms to the right
-5x=-35
x=-35/-5
x=+7
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