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80x-100=20(4x-5)
We move all terms to the left:
80x-100-(20(4x-5))=0
We calculate terms in parentheses: -(20(4x-5)), so:We get rid of parentheses
20(4x-5)
We multiply parentheses
80x-100
Back to the equation:
-(80x-100)
80x-80x+100-100=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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