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6(r-7)=-42+6r
We move all terms to the left:
6(r-7)-(-42+6r)=0
We add all the numbers together, and all the variables
6(r-7)-(6r-42)=0
We multiply parentheses
6r-(6r-42)-42=0
We get rid of parentheses
6r-6r+42-42=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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