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4t-2t=12+7
We move all terms to the left:
4t-2t-(12+7)=0
We add all the numbers together, and all the variables
4t-2t-19=0
We add all the numbers together, and all the variables
2t-19=0
We move all terms containing t to the left, all other terms to the right
2t=19
t=19/2
t=9+1/2
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