12+6t=21

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Solution for 12+6t=21 equation: 



12+6t=21

We move all terms to the left:

12+6t-(21)=0

We add all the numbers together, and all the variables

6t-9=0

We move all terms containing t to the left, all other terms to the right

6t=9

t=9/6

t=1+1/2

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