3r=450+r

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Solution for 3r=450+r equation: 



3r=450+r

We move all terms to the left:

3r-(450+r)=0

We add all the numbers together, and all the variables

3r-(r+450)=0

We get rid of parentheses

3r-r-450=0

We add all the numbers together, and all the variables

2r-450=0

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

2r=450

r=450/2

r=225

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