45=5r+3r+r

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Solution for 45=5r+3r+r equation: 



45=5r+3r+r

We move all terms to the left:

45-(5r+3r+r)=0

We add all the numbers together, and all the variables

-(+9r)+45=0

We get rid of parentheses

-9r+45=0

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

-9r=-45

r=-45/-9

r=+5

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