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9t-21=3(t-7)
We move all terms to the left:
9t-21-(3(t-7))=0
We calculate terms in parentheses: -(3(t-7)), so:We get rid of parentheses
3(t-7)
We multiply parentheses
3t-21
Back to the equation:
-(3t-21)
9t-3t+21-21=0
We add all the numbers together, and all the variables
6t=0
t=0/6
t=0
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