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12=t/2+9
We move all terms to the left:
12-(t/2+9)=0
We get rid of parentheses
-t/2-9+12=0
We multiply all the terms by the denominator
-t-9*2+12*2=0
We add all the numbers together, and all the variables
-1t+6=0
We move all terms containing t to the left, all other terms to the right
-t=-6
t=-6/-1
t=+6
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