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92=-4(2r-5)-9
We move all terms to the left:
92-(-4(2r-5)-9)=0
We calculate terms in parentheses: -(-4(2r-5)-9), so:We get rid of parentheses
-4(2r-5)-9
We multiply parentheses
-8r+20-9
We add all the numbers together, and all the variables
-8r+11
Back to the equation:
-(-8r+11)
8r-11+92=0
We add all the numbers together, and all the variables
8r+81=0
We move all terms containing r to the left, all other terms to the right
8r=-81
r=-81/8
r=-10+1/8
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