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3t=5t-12=t+20
We move all terms to the left:
3t-(5t-12)=0
We get rid of parentheses
3t-5t+12=0
We add all the numbers together, and all the variables
-2t+12=0
We move all terms containing t to the left, all other terms to the right
-2t=-12
t=-12/-2
t=+6
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