21=0.5t+6

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Solution for 21=0.5t+6 equation: 



21=0.5t+6

We move all terms to the left:

21-(0.5t+6)=0

We get rid of parentheses

-0.5t-6+21=0

We add all the numbers together, and all the variables

-0.5t+15=0

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

-0.5t=-15

t=-15/-0.5

t=+30

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