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180=(x+15)+(2x-20)+2x
We move all terms to the left:
180-((x+15)+(2x-20)+2x)=0
We calculate terms in parentheses: -((x+15)+(2x-20)+2x), so:We get rid of parentheses
(x+15)+(2x-20)+2x
We add all the numbers together, and all the variables
2x+(x+15)+(2x-20)
We get rid of parentheses
2x+x+2x+15-20
We add all the numbers together, and all the variables
5x-5
Back to the equation:
-(5x-5)
-5x+5+180=0
We add all the numbers together, and all the variables
-5x+185=0
We move all terms containing x to the left, all other terms to the right
-5x=-185
x=-185/-5
x=+37
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