3t+21=9

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Solution for 3t+21=9 equation: 



3t+21=9

We move all terms to the left:

3t+21-(9)=0

We add all the numbers together, and all the variables

3t+12=0

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

3t=-12

t=-12/3

t=-4

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