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20t-15t+4t-9t+3t=9
We move all terms to the left:
20t-15t+4t-9t+3t-(9)=0
We add all the numbers together, and all the variables
3t-9=0
We move all terms containing t to the left, all other terms to the right
3t=9
t=9/3
t=3
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