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8-9t=21t-27
We move all terms to the left:
8-9t-(21t-27)=0
We get rid of parentheses
-9t-21t+27+8=0
We add all the numbers together, and all the variables
-30t+35=0
We move all terms containing t to the left, all other terms to the right
-30t=-35
t=-35/-30
t=1+1/6
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