90=10(s-90)

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



90=10(s-90)

We move all terms to the left:

90-(10(s-90))=0



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

10(s-90)

We multiply parentheses

10s-900

Back to the equation:

-(10s-900)



We get rid of parentheses

-10s+900+90=0

We add all the numbers together, and all the variables

-10s+990=0

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

-10s=-990

s=-990/-10

s=+99

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