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12t=45+3t
We move all terms to the left:
12t-(45+3t)=0
We add all the numbers together, and all the variables
12t-(3t+45)=0
We get rid of parentheses
12t-3t-45=0
We add all the numbers together, and all the variables
9t-45=0
We move all terms containing t to the left, all other terms to the right
9t=45
t=45/9
t=5
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