-90=-10(q-91)

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Solution for -90=-10(q-91) equation: 



-90=-10(q-91)

We move all terms to the left:

-90-(-10(q-91))=0



We calculate terms in parentheses: -(-10(q-91)), so:

-10(q-91)

We multiply parentheses

-10q+910

Back to the equation:

-(-10q+910)



We get rid of parentheses

10q-910-90=0

We add all the numbers together, and all the variables

10q-1000=0

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

10q=1000

q=1000/10

q=100

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