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6r-4r=-15+5r
We move all terms to the left:
6r-4r-(-15+5r)=0
We add all the numbers together, and all the variables
6r-4r-(5r-15)=0
We add all the numbers together, and all the variables
2r-(5r-15)=0
We get rid of parentheses
2r-5r+15=0
We add all the numbers together, and all the variables
-3r+15=0
We move all terms containing r to the left, all other terms to the right
-3r=-15
r=-15/-3
r=+5
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