6=21-5t

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Solution for 6=21-5t equation: 



6=21-5t

We move all terms to the left:

6-(21-5t)=0

We add all the numbers together, and all the variables

-(-5t+21)+6=0

We get rid of parentheses

5t-21+6=0

We add all the numbers together, and all the variables

5t-15=0

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

5t=15

t=15/5

t=3

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