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2(12+3t)=42
We move all terms to the left:
2(12+3t)-(42)=0
We add all the numbers together, and all the variables
2(3t+12)-42=0
We multiply parentheses
6t+24-42=0
We add all the numbers together, and all the variables
6t-18=0
We move all terms containing t to the left, all other terms to the right
6t=18
t=18/6
t=3
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