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180=(x+20)+70(3x)
We move all terms to the left:
180-((x+20)+70(3x))=0
We calculate terms in parentheses: -((x+20)+703x), so:We get rid of parentheses
(x+20)+703x
We add all the numbers together, and all the variables
703x+(x+20)
We get rid of parentheses
703x+x+20
We add all the numbers together, and all the variables
704x+20
Back to the equation:
-(704x+20)
-704x-20+180=0
We add all the numbers together, and all the variables
-704x+160=0
We move all terms containing x to the left, all other terms to the right
-704x=-160
x=-160/-704
x=5/22
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