15=6+r/2

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Solution for 15=6+r/2 equation: 



15=6+r/2

We move all terms to the left:

15-(6+r/2)=0

We add all the numbers together, and all the variables

-(r/2+6)+15=0

We get rid of parentheses

-r/2-6+15=0

We multiply all the terms by the denominator


-r-6*2+15*2=0

We add all the numbers together, and all the variables

-1r+18=0

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

-r=-18

r=-18/-1

r=+18

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