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-20-9t=7t+12
We move all terms to the left:
-20-9t-(7t+12)=0
We get rid of parentheses
-9t-7t-12-20=0
We add all the numbers together, and all the variables
-16t-32=0
We move all terms containing t to the left, all other terms to the right
-16t=32
t=32/-16
t=-2
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