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-18=-6(t-81)
We move all terms to the left:
-18-(-6(t-81))=0
We calculate terms in parentheses: -(-6(t-81)), so:We get rid of parentheses
-6(t-81)
We multiply parentheses
-6t+486
Back to the equation:
-(-6t+486)
6t-486-18=0
We add all the numbers together, and all the variables
6t-504=0
We move all terms containing t to the left, all other terms to the right
6t=504
t=504/6
t=84
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