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6r+38=4(5r-1)
We move all terms to the left:
6r+38-(4(5r-1))=0
We calculate terms in parentheses: -(4(5r-1)), so:We get rid of parentheses
4(5r-1)
We multiply parentheses
20r-4
Back to the equation:
-(20r-4)
6r-20r+4+38=0
We add all the numbers together, and all the variables
-14r+42=0
We move all terms containing r to the left, all other terms to the right
-14r=-42
r=-42/-14
r=+3
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