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2.8t+7.2=12.8
We move all terms to the left:
2.8t+7.2-(12.8)=0
We add all the numbers together, and all the variables
2.8t-5.6=0
We move all terms containing t to the left, all other terms to the right
2.8t=5.6
t=5.6/2.8
t=2
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