-18=-9(f-90)

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Solution for -18=-9(f-90) equation: 



-18=-9(f-90)

We move all terms to the left:

-18-(-9(f-90))=0



We calculate terms in parentheses: -(-9(f-90)), so:

-9(f-90)

We multiply parentheses

-9f+810

Back to the equation:

-(-9f+810)



We get rid of parentheses

9f-810-18=0

We add all the numbers together, and all the variables

9f-828=0

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

9f=828

f=828/9

f=92

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