-12r-15r+15r+7r=10

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Solution for -12r-15r+15r+7r=10 equation: 



-12r-15r+15r+7r=10

We move all terms to the left:

-12r-15r+15r+7r-(10)=0

We add all the numbers together, and all the variables

-5r-10=0

We move all terms containing r to the left, all other terms to the right

-5r=10

r=10/-5

r=-2

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