15+3r=78

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Solution for 15+3r=78 equation: 



15+3r=78

We move all terms to the left:

15+3r-(78)=0

We add all the numbers together, and all the variables

3r-63=0

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

3r=63

r=63/3

r=21

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