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7(5+5r)=-19+8r
We move all terms to the left:
7(5+5r)-(-19+8r)=0
We add all the numbers together, and all the variables
7(5r+5)-(8r-19)=0
We multiply parentheses
35r-(8r-19)+35=0
We get rid of parentheses
35r-8r+19+35=0
We add all the numbers together, and all the variables
27r+54=0
We move all terms containing r to the left, all other terms to the right
27r=-54
r=-54/27
r=-2
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