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-10+5r=-7-12-10
We move all terms to the left:
-10+5r-(-7-12-10)=0
We add all the numbers together, and all the variables
5r-10-(-29)=0
We add all the numbers together, and all the variables
5r+19=0
We move all terms containing r to the left, all other terms to the right
5r=-19
r=-19/5
r=-3+4/5
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