(2r-1)-3=15

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Solution for (2r-1)-3=15 equation: 



(2r-1)-3=15

We move all terms to the left:

(2r-1)-3-(15)=0

We add all the numbers together, and all the variables

(2r-1)-18=0

We get rid of parentheses

2r-1-18=0

We add all the numbers together, and all the variables

2r-19=0

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

2r=19

r=19/2

r=9+1/2

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