3(5t-8)=21

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Solution for 3(5t-8)=21 equation: 



3(5t-8)=21

We move all terms to the left:

3(5t-8)-(21)=0

We multiply parentheses

15t-24-21=0

We add all the numbers together, and all the variables

15t-45=0

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

15t=45

t=45/15

t=3

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