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30t=2t-40
We move all terms to the left:
30t-(2t-40)=0
We get rid of parentheses
30t-2t+40=0
We add all the numbers together, and all the variables
28t+40=0
We move all terms containing t to the left, all other terms to the right
28t=-40
t=-40/28
t=-1+3/7
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