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-18=-3(t-9)
We move all terms to the left:
-18-(-3(t-9))=0
We calculate terms in parentheses: -(-3(t-9)), so:We get rid of parentheses
-3(t-9)
We multiply parentheses
-3t+27
Back to the equation:
-(-3t+27)
3t-27-18=0
We add all the numbers together, and all the variables
3t-45=0
We move all terms containing t to the left, all other terms to the right
3t=45
t=45/3
t=15
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