2t-9=3t+21

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Solution for 2t-9=3t+21 equation: 



2t-9=3t+21

We move all terms to the left:

2t-9-(3t+21)=0

We get rid of parentheses

2t-3t-21-9=0

We add all the numbers together, and all the variables

-1t-30=0

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

-t=30

t=30/-1

t=-30

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