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70=50+50(r*10)
We move all terms to the left:
70-(50+50(r*10))=0
We add all the numbers together, and all the variables
-(50+50(+r*10))+70=0
We calculate terms in parentheses: -(50+50(+r*10)), so:We get rid of parentheses
50+50(+r*10)
determiningTheFunctionDomain 50(+r*10)+50
We multiply parentheses
500r+50
Back to the equation:
-(500r+50)
-500r-50+70=0
We add all the numbers together, and all the variables
-500r+20=0
We move all terms containing r to the left, all other terms to the right
-500r=-20
r=-20/-500
r=1/25
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