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80=-9(t-9)-19
We move all terms to the left:
80-(-9(t-9)-19)=0
We calculate terms in parentheses: -(-9(t-9)-19), so:We get rid of parentheses
-9(t-9)-19
We multiply parentheses
-9t+81-19
We add all the numbers together, and all the variables
-9t+62
Back to the equation:
-(-9t+62)
9t-62+80=0
We add all the numbers together, and all the variables
9t+18=0
We move all terms containing t to the left, all other terms to the right
9t=-18
t=-18/9
t=-2
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