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100x-180=20(5x-9)
We move all terms to the left:
100x-180-(20(5x-9))=0
We calculate terms in parentheses: -(20(5x-9)), so:We get rid of parentheses
20(5x-9)
We multiply parentheses
100x-180
Back to the equation:
-(100x-180)
100x-100x+180-180=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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