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12=6t+9
We move all terms to the left:
12-(6t+9)=0
We get rid of parentheses
-6t-9+12=0
We add all the numbers together, and all the variables
-6t+3=0
We move all terms containing t to the left, all other terms to the right
-6t=-3
t=-3/-6
t=1/2
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