87=9+6r

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Solution for 87=9+6r equation: 



87=9+6r

We move all terms to the left:

87-(9+6r)=0

We add all the numbers together, and all the variables

-(6r+9)+87=0

We get rid of parentheses

-6r-9+87=0

We add all the numbers together, and all the variables

-6r+78=0

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

-6r=-78

r=-78/-6

r=+13

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