-7-15=-2r;-3

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Solution for -7-15=-2r;-3 equation: 



-7-15=-2r-3

We move all terms to the left:

-7-15-(-2r-3)=0

We add all the numbers together, and all the variables

-(-2r-3)-22=0

We get rid of parentheses

2r+3-22=0

We add all the numbers together, and all the variables

2r-19=0

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

2r=19

r=19/2

r=9+1/2

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