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7(3r-1)-(r+5)=-56
We move all terms to the left:
7(3r-1)-(r+5)-(-56)=0
We add all the numbers together, and all the variables
7(3r-1)-(r+5)+56=0
We multiply parentheses
21r-(r+5)-7+56=0
We get rid of parentheses
21r-r-5-7+56=0
We add all the numbers together, and all the variables
20r+44=0
We move all terms containing r to the left, all other terms to the right
20r=-44
r=-44/20
r=-2+1/5
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