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171=1-5(-4-6r)
We move all terms to the left:
171-(1-5(-4-6r))=0
We add all the numbers together, and all the variables
-(1-5(-6r-4))+171=0
We calculate terms in parentheses: -(1-5(-6r-4)), so:We get rid of parentheses
1-5(-6r-4)
determiningTheFunctionDomain -5(-6r-4)+1
We multiply parentheses
30r+20+1
We add all the numbers together, and all the variables
30r+21
Back to the equation:
-(30r+21)
-30r-21+171=0
We add all the numbers together, and all the variables
-30r+150=0
We move all terms containing r to the left, all other terms to the right
-30r=-150
r=-150/-30
r=+5
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