15+2r=-5

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Solution for 15+2r=-5 equation: 



15+2r=-5

We move all terms to the left:

15+2r-(-5)=0

We add all the numbers together, and all the variables

2r+20=0

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

2r=-20

r=-20/2

r=-10

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