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20=x-5(7x-4)
We move all terms to the left:
20-(x-5(7x-4))=0
We calculate terms in parentheses: -(x-5(7x-4)), so:We get rid of parentheses
x-5(7x-4)
We multiply parentheses
x-35x+20
We add all the numbers together, and all the variables
-34x+20
Back to the equation:
-(-34x+20)
34x-20+20=0
We add all the numbers together, and all the variables
34x=0
x=0/34
x=0
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