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5(r-3)=-90
We move all terms to the left:
5(r-3)-(-90)=0
We add all the numbers together, and all the variables
5(r-3)+90=0
We multiply parentheses
5r-15+90=0
We add all the numbers together, and all the variables
5r+75=0
We move all terms containing r to the left, all other terms to the right
5r=-75
r=-75/5
r=-15
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