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3t-9=4(t-4)
We move all terms to the left:
3t-9-(4(t-4))=0
We calculate terms in parentheses: -(4(t-4)), so:We get rid of parentheses
4(t-4)
We multiply parentheses
4t-16
Back to the equation:
-(4t-16)
3t-4t+16-9=0
We add all the numbers together, and all the variables
-1t+7=0
We move all terms containing t to the left, all other terms to the right
-t=-7
t=-7/-1
t=+7
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