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t+2(t-3)=9
We move all terms to the left:
t+2(t-3)-(9)=0
We multiply parentheses
t+2t-6-9=0
We add all the numbers together, and all the variables
3t-15=0
We move all terms containing t to the left, all other terms to the right
3t=15
t=15/3
t=5
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