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40=5(3x-4)
We move all terms to the left:
40-(5(3x-4))=0
We calculate terms in parentheses: -(5(3x-4)), so:We get rid of parentheses
5(3x-4)
We multiply parentheses
15x-20
Back to the equation:
-(15x-20)
-15x+20+40=0
We add all the numbers together, and all the variables
-15x+60=0
We move all terms containing x to the left, all other terms to the right
-15x=-60
x=-60/-15
x=+4
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