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3t-6=6t-21
We move all terms to the left:
3t-6-(6t-21)=0
We get rid of parentheses
3t-6t+21-6=0
We add all the numbers together, and all the variables
-3t+15=0
We move all terms containing t to the left, all other terms to the right
-3t=-15
t=-15/-3
t=+5
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