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3t+4=12t+3t
We move all terms to the left:
3t+4-(12t+3t)=0
We add all the numbers together, and all the variables
3t-(+15t)+4=0
We get rid of parentheses
3t-15t+4=0
We add all the numbers together, and all the variables
-12t+4=0
We move all terms containing t to the left, all other terms to the right
-12t=-4
t=-4/-12
t=1/3
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