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-9=-3(2t-1)
We move all terms to the left:
-9-(-3(2t-1))=0
We calculate terms in parentheses: -(-3(2t-1)), so:We get rid of parentheses
-3(2t-1)
We multiply parentheses
-6t+3
Back to the equation:
-(-6t+3)
6t-3-9=0
We add all the numbers together, and all the variables
6t-12=0
We move all terms containing t to the left, all other terms to the right
6t=12
t=12/6
t=2
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