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-4(r-5)-7=-4r+13
We move all terms to the left:
-4(r-5)-7-(-4r+13)=0
We multiply parentheses
-4r-(-4r+13)+20-7=0
We get rid of parentheses
-4r+4r-13+20-7=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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