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13=t/9+15
We move all terms to the left:
13-(t/9+15)=0
We get rid of parentheses
-t/9-15+13=0
We multiply all the terms by the denominator
-t-15*9+13*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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