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50=10(r+8)
We move all terms to the left:
50-(10(r+8))=0
We calculate terms in parentheses: -(10(r+8)), so:We get rid of parentheses
10(r+8)
We multiply parentheses
10r+80
Back to the equation:
-(10r+80)
-10r-80+50=0
We add all the numbers together, and all the variables
-10r-30=0
We move all terms containing r to the left, all other terms to the right
-10r=30
r=30/-10
r=-3
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