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180=(x-10)+(x+30)
We move all terms to the left:
180-((x-10)+(x+30))=0
We calculate terms in parentheses: -((x-10)+(x+30)), so:We get rid of parentheses
(x-10)+(x+30)
We get rid of parentheses
x+x-10+30
We add all the numbers together, and all the variables
2x+20
Back to the equation:
-(2x+20)
-2x-20+180=0
We add all the numbers together, and all the variables
-2x+160=0
We move all terms containing x to the left, all other terms to the right
-2x=-160
x=-160/-2
x=+80
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