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9-4t=19.4
We move all terms to the left:
9-4t-(19.4)=0
We add all the numbers together, and all the variables
-4t-10.4=0
We move all terms containing t to the left, all other terms to the right
-4t=10.4
t=10.4/-4
t=-2+1/1.6666666666667
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