9=21-2tt=

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Solution for 9=21-2tt= equation: 



9=21-2tt=

We move all terms to the left:

9-(21-2tt)=0

We add all the numbers together, and all the variables

-(-2tt+21)+9=0

We get rid of parentheses

2tt-21+9=0

We add all the numbers together, and all the variables

2tt-12=0

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

2tt=12

t=12/1

t=12

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