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180=(10x+20)*3
We move all terms to the left:
180-((10x+20)*3)=0
We calculate terms in parentheses: -((10x+20)*3), so:We get rid of parentheses
(10x+20)*3
We multiply parentheses
30x+60
Back to the equation:
-(30x+60)
-30x-60+180=0
We add all the numbers together, and all the variables
-30x+120=0
We move all terms containing x to the left, all other terms to the right
-30x=-120
x=-120/-30
x=+4
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