15+10r=45

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Solution for 15+10r=45 equation: 



15+10r=45

We move all terms to the left:

15+10r-(45)=0

We add all the numbers together, and all the variables

10r-30=0

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

10r=30

r=30/10

r=3

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