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81=9(t+1)
We move all terms to the left:
81-(9(t+1))=0
We calculate terms in parentheses: -(9(t+1)), so:We get rid of parentheses
9(t+1)
We multiply parentheses
9t+9
Back to the equation:
-(9t+9)
-9t-9+81=0
We add all the numbers together, and all the variables
-9t+72=0
We move all terms containing t to the left, all other terms to the right
-9t=-72
t=-72/-9
t=+8
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