87=-3+9r

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Solution for 87=-3+9r equation: 



87=-3+9r

We move all terms to the left:

87-(-3+9r)=0

We add all the numbers together, and all the variables

-(9r-3)+87=0

We get rid of parentheses

-9r+3+87=0

We add all the numbers together, and all the variables

-9r+90=0

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

-9r=-90

r=-90/-9

r=+10

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