15=4r+7

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Solution for 15=4r+7 equation: 



15=4r+7

We move all terms to the left:

15-(4r+7)=0

We get rid of parentheses

-4r-7+15=0

We add all the numbers together, and all the variables

-4r+8=0

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

-4r=-8

r=-8/-4

r=+2

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