-21+6=-3t

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Solution for -21+6=-3t equation: 



-21+6=-3t

We move all terms to the left:

-21+6-(-3t)=0

We add all the numbers together, and all the variables

-(-3t)-15=0

We get rid of parentheses

3t-15=0

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

3t=15

t=15/3

t=5

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