20=13a-3(6a-7)-1

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Solution for 20=13a-3(6a-7)-1 equation: 



20=13a-3(6a-7)-1

We move all terms to the left:

20-(13a-3(6a-7)-1)=0



We calculate terms in parentheses: -(13a-3(6a-7)-1), so:

13a-3(6a-7)-1

We multiply parentheses

13a-18a+21-1

We add all the numbers together, and all the variables

-5a+20

Back to the equation:

-(-5a+20)



We get rid of parentheses

5a-20+20=0

We add all the numbers together, and all the variables

5a=0

a=0/5

a=0

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