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80x-180=20(4x-9)
We move all terms to the left:
80x-180-(20(4x-9))=0
We calculate terms in parentheses: -(20(4x-9)), so:We get rid of parentheses
20(4x-9)
We multiply parentheses
80x-180
Back to the equation:
-(80x-180)
80x-80x+180-180=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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