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30=t/9+28
We move all terms to the left:
30-(t/9+28)=0
We get rid of parentheses
-t/9-28+30=0
We multiply all the terms by the denominator
-t-28*9+30*9=0
We add all the numbers together, and all the variables
-1t+18=0
We move all terms containing t to the left, all other terms to the right
-t=-18
t=-18/-1
t=+18
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