(-15)-(-3t)=-21

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Solution for (-15)-(-3t)=-21 equation: 



(-15)-(-3t)=-21

We move all terms to the left:

(-15)-(-3t)-(-21)=0

We add all the numbers together, and all the variables

-(-3t)+6=0

We get rid of parentheses

3t+6=0

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

3t=-6

t=-6/3

t=-2

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