1+3r-r=15

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Solution for 1+3r-r=15 equation: 



1+3r-r=15

We move all terms to the left:

1+3r-r-(15)=0

We add all the numbers together, and all the variables

2r-14=0

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

2r=14

r=14/2

r=7

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