15+r=-15+2r

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Solution for 15+r=-15+2r equation: 



15+r=-15+2r

We move all terms to the left:

15+r-(-15+2r)=0

We add all the numbers together, and all the variables

r-(2r-15)+15=0

We get rid of parentheses

r-2r+15+15=0

We add all the numbers together, and all the variables

-1r+30=0

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

-r=-30

r=-30/-1

r=+30

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