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-3(1+5r)+7r=9-5r
We move all terms to the left:
-3(1+5r)+7r-(9-5r)=0
We add all the numbers together, and all the variables
-3(5r+1)+7r-(-5r+9)=0
We add all the numbers together, and all the variables
7r-3(5r+1)-(-5r+9)=0
We multiply parentheses
7r-15r-(-5r+9)-3=0
We get rid of parentheses
7r-15r+5r-9-3=0
We add all the numbers together, and all the variables
-3r-12=0
We move all terms containing r to the left, all other terms to the right
-3r=12
r=12/-3
r=-4
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