7a-4=3(a+9)-4a

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Solution for 7a-4=3(a+9)-4a equation: 



7a-4=3(a+9)-4a

We move all terms to the left:

7a-4-(3(a+9)-4a)=0



We calculate terms in parentheses: -(3(a+9)-4a), so:

3(a+9)-4a

We add all the numbers together, and all the variables

-4a+3(a+9)

We multiply parentheses

-4a+3a+27

We add all the numbers together, and all the variables

-1a+27

Back to the equation:

-(-1a+27)



We get rid of parentheses

7a+1a-27-4=0

We add all the numbers together, and all the variables

8a-31=0

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

8a=31

a=31/8

a=3+7/8

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