-15-2r=3

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Solution for -15-2r=3 equation: 



-15-2r=3

We move all terms to the left:

-15-2r-(3)=0

We add all the numbers together, and all the variables

-2r-18=0

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

-2r=18

r=18/-2

r=-9

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