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48=8(r-90)
We move all terms to the left:
48-(8(r-90))=0
We calculate terms in parentheses: -(8(r-90)), so:We get rid of parentheses
8(r-90)
We multiply parentheses
8r-720
Back to the equation:
-(8r-720)
-8r+720+48=0
We add all the numbers together, and all the variables
-8r+768=0
We move all terms containing r to the left, all other terms to the right
-8r=-768
r=-768/-8
r=+96
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