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3+9t+12=15+9t
We move all terms to the left:
3+9t+12-(15+9t)=0
We add all the numbers together, and all the variables
9t-(9t+15)+3+12=0
We add all the numbers together, and all the variables
9t-(9t+15)+15=0
We get rid of parentheses
9t-9t-15+15=0
We add all the numbers together, and all the variables
=0
t=0/1
t=0
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