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30=9t+12
We move all terms to the left:
30-(9t+12)=0
We get rid of parentheses
-9t-12+30=0
We add all the numbers together, and all the variables
-9t+18=0
We move all terms containing t to the left, all other terms to the right
-9t=-18
t=-18/-9
t=+2
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