10r-9r-1=7

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Solution for 10r-9r-1=7 equation: 



10r-9r-1=7

We move all terms to the left:

10r-9r-1-(7)=0

We add all the numbers together, and all the variables

r-8=0

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

r=8

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