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180=(13x-42)+(7x+22)
We move all terms to the left:
180-((13x-42)+(7x+22))=0
We calculate terms in parentheses: -((13x-42)+(7x+22)), so:We get rid of parentheses
(13x-42)+(7x+22)
We get rid of parentheses
13x+7x-42+22
We add all the numbers together, and all the variables
20x-20
Back to the equation:
-(20x-20)
-20x+20+180=0
We add all the numbers together, and all the variables
-20x+200=0
We move all terms containing x to the left, all other terms to the right
-20x=-200
x=-200/-20
x=+10
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