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30t-19=15t-4
We move all terms to the left:
30t-19-(15t-4)=0
We get rid of parentheses
30t-15t+4-19=0
We add all the numbers together, and all the variables
15t-15=0
We move all terms containing t to the left, all other terms to the right
15t=15
t=15/15
t=1
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