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115=1+6(5r+4)
We move all terms to the left:
115-(1+6(5r+4))=0
We calculate terms in parentheses: -(1+6(5r+4)), so:We get rid of parentheses
1+6(5r+4)
determiningTheFunctionDomain 6(5r+4)+1
We multiply parentheses
30r+24+1
We add all the numbers together, and all the variables
30r+25
Back to the equation:
-(30r+25)
-30r-25+115=0
We add all the numbers together, and all the variables
-30r+90=0
We move all terms containing r to the left, all other terms to the right
-30r=-90
r=-90/-30
r=+3
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