13=21-4t

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Solution for 13=21-4t equation: 



13=21-4t

We move all terms to the left:

13-(21-4t)=0

We add all the numbers together, and all the variables

-(-4t+21)+13=0

We get rid of parentheses

4t-21+13=0

We add all the numbers together, and all the variables

4t-8=0

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

4t=8

t=8/4

t=2

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