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240=10(8+r)
We move all terms to the left:
240-(10(8+r))=0
We add all the numbers together, and all the variables
-(10(r+8))+240=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+240=0
We add all the numbers together, and all the variables
-10r+160=0
We move all terms containing r to the left, all other terms to the right
-10r=-160
r=-160/-10
r=+16
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