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94=-4(2r-5)
We move all terms to the left:
94-(-4(2r-5))=0
We calculate terms in parentheses: -(-4(2r-5)), so:We get rid of parentheses
-4(2r-5)
We multiply parentheses
-8r+20
Back to the equation:
-(-8r+20)
8r-20+94=0
We add all the numbers together, and all the variables
8r+74=0
We move all terms containing r to the left, all other terms to the right
8r=-74
r=-74/8
r=-9+1/4
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