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13=t/4+9
We move all terms to the left:
13-(t/4+9)=0
We get rid of parentheses
-t/4-9+13=0
We multiply all the terms by the denominator
-t-9*4+13*4=0
We add all the numbers together, and all the variables
-1t+16=0
We move all terms containing t to the left, all other terms to the right
-t=-16
t=-16/-1
t=+16
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