90=r+3

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Solution for 90=r+3 equation: 



90=r+3

We move all terms to the left:

90-(r+3)=0

We get rid of parentheses

-r-3+90=0

We add all the numbers together, and all the variables

-1r+87=0

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

-r=-87

r=-87/-1

r=+87

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