4(15-1a)=20-9a

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Solution for 4(15-1a)=20-9a equation: 



4(15-1a)=20-9a

We move all terms to the left:

4(15-1a)-(20-9a)=0

We add all the numbers together, and all the variables

4(-1a+15)-(-9a+20)=0

We multiply parentheses

-4a-(-9a+20)+60=0

We get rid of parentheses

-4a+9a-20+60=0

We add all the numbers together, and all the variables

5a+40=0

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

5a=-40

a=-40/5

a=-8

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