9t-21=3(t-7)-6t

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Solution for 9t-21=3(t-7)-6t equation: 



9t-21=3(t-7)-6t

We move all terms to the left:

9t-21-(3(t-7)-6t)=0



We calculate terms in parentheses: -(3(t-7)-6t), so:

3(t-7)-6t

We add all the numbers together, and all the variables

-6t+3(t-7)

We multiply parentheses

-6t+3t-21

We add all the numbers together, and all the variables

-3t-21

Back to the equation:

-(-3t-21)



We get rid of parentheses

9t+3t+21-21=0

We add all the numbers together, and all the variables

12t=0

t=0/12

t=0

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