9(t-1)=90

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Solution for 9(t-1)=90 equation: 



9(t-1)=90

We move all terms to the left:

9(t-1)-(90)=0

We multiply parentheses

9t-9-90=0

We add all the numbers together, and all the variables

9t-99=0

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

9t=99

t=99/9

t=11

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