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180=2(x+15)+(3x+20)
We move all terms to the left:
180-(2(x+15)+(3x+20))=0
We calculate terms in parentheses: -(2(x+15)+(3x+20)), so:We get rid of parentheses
2(x+15)+(3x+20)
We multiply parentheses
2x+(3x+20)+30
We get rid of parentheses
2x+3x+20+30
We add all the numbers together, and all the variables
5x+50
Back to the equation:
-(5x+50)
-5x-50+180=0
We add all the numbers together, and all the variables
-5x+130=0
We move all terms containing x to the left, all other terms to the right
-5x=-130
x=-130/-5
x=+26
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