-10=-10(r-90)

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Solution for -10=-10(r-90) equation: 



-10=-10(r-90)

We move all terms to the left:

-10-(-10(r-90))=0



We calculate terms in parentheses: -(-10(r-90)), so:

-10(r-90)

We multiply parentheses

-10r+900

Back to the equation:

-(-10r+900)



We get rid of parentheses

10r-900-10=0

We add all the numbers together, and all the variables

10r-910=0

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

10r=910

r=910/10

r=91

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