7=15-2r

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Solution for 7=15-2r equation: 



7=15-2r

We move all terms to the left:

7-(15-2r)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

2r-15+7=0

We add all the numbers together, and all the variables

2r-8=0

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

2r=8

r=8/2

r=4

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