13a-4=3(5a+4)-20

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Solution for 13a-4=3(5a+4)-20 equation: 



13a-4=3(5a+4)-20

We move all terms to the left:

13a-4-(3(5a+4)-20)=0



We calculate terms in parentheses: -(3(5a+4)-20), so:

3(5a+4)-20

We multiply parentheses

15a+12-20

We add all the numbers together, and all the variables

15a-8

Back to the equation:

-(15a-8)



We get rid of parentheses

13a-15a+8-4=0

We add all the numbers together, and all the variables

-2a+4=0

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

-2a=-4

a=-4/-2

a=+2

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