r-3*(r-5)=0

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Solution for r-3*(r-5)=0 equation: 



r-3*(r-5)=0

We multiply parentheses

r-3r+15=0

We add all the numbers together, and all the variables

-2r+15=0

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

-2r=-15

r=-15/-2

r=7+1/2

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