10r-1=8r-9

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Solution for 10r-1=8r-9 equation: 



10r-1=8r-9

We move all terms to the left:

10r-1-(8r-9)=0

We get rid of parentheses

10r-8r+9-1=0

We add all the numbers together, and all the variables

2r+8=0

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

2r=-8

r=-8/2

r=-4

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