21=3t+8

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Solution for 21=3t+8 equation: 



21=3t+8

We move all terms to the left:

21-(3t+8)=0

We get rid of parentheses

-3t-8+21=0

We add all the numbers together, and all the variables

-3t+13=0

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

-3t=-13

t=-13/-3

t=4+1/3

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