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10+2r=-10r-3r
We move all terms to the left:
10+2r-(-10r-3r)=0
We add all the numbers together, and all the variables
2r-(-13r)+10=0
We get rid of parentheses
2r+13r+10=0
We add all the numbers together, and all the variables
15r+10=0
We move all terms containing r to the left, all other terms to the right
15r=-10
r=-10/15
r=-2/3
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