10r-15=r+21

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Solution for 10r-15=r+21 equation: 



10r-15=r+21

We move all terms to the left:

10r-15-(r+21)=0

We get rid of parentheses

10r-r-21-15=0

We add all the numbers together, and all the variables

9r-36=0

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

9r=36

r=36/9

r=4

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