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3t-2t+3t+4t-4t=12
We move all terms to the left:
3t-2t+3t+4t-4t-(12)=0
We add all the numbers together, and all the variables
4t-12=0
We move all terms containing t to the left, all other terms to the right
4t=12
t=12/4
t=3
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