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-10=-9+r/4

We move all terms to the left:

-10-(-9+r/4)=0

We add all the numbers together, and all the variables

-(r/4-9)-10=0

We get rid of parentheses

-r/4+9-10=0

We multiply all the terms by the denominator

-r+9*4-10*4=0

We add all the numbers together, and all the variables

-1r-4=0

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

-r=4

r=4/-1

r=-4

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