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