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-5(r-5)=21-6r
We move all terms to the left:
-5(r-5)-(21-6r)=0
We add all the numbers together, and all the variables
-5(r-5)-(-6r+21)=0
We multiply parentheses
-5r-(-6r+21)+25=0
We get rid of parentheses
-5r+6r-21+25=0
We add all the numbers together, and all the variables
r+4=0
We move all terms containing r to the left, all other terms to the right
r=-4
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