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-45=-9(t-89)
We move all terms to the left:
-45-(-9(t-89))=0
We calculate terms in parentheses: -(-9(t-89)), so:We get rid of parentheses
-9(t-89)
We multiply parentheses
-9t+801
Back to the equation:
-(-9t+801)
9t-801-45=0
We add all the numbers together, and all the variables
9t-846=0
We move all terms containing t to the left, all other terms to the right
9t=846
t=846/9
t=94
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