-290=10(-9+r)

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Solution for -290=10(-9+r) equation: 



-290=10(-9+r)

We move all terms to the left:

-290-(10(-9+r))=0

We add all the numbers together, and all the variables

-(10(r-9))-290=0



We calculate terms in parentheses: -(10(r-9)), so:

10(r-9)

We multiply parentheses

10r-90

Back to the equation:

-(10r-90)



We get rid of parentheses

-10r+90-290=0

We add all the numbers together, and all the variables

-10r-200=0

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

-10r=200

r=200/-10

r=-20

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