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-t/3-9=-12
We move all terms to the left:
-t/3-9-(-12)=0
We add all the numbers together, and all the variables
-t/3+3=0
We multiply all the terms by the denominator
-t+3*3=0
We add all the numbers together, and all the variables
-1t+9=0
We move all terms containing t to the left, all other terms to the right
-t=-9
t=-9/-1
t=+9
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