15=6(a-4)+7a

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Solution for 15=6(a-4)+7a equation: 



15=6(a-4)+7a

We move all terms to the left:

15-(6(a-4)+7a)=0



We calculate terms in parentheses: -(6(a-4)+7a), so:

6(a-4)+7a

We add all the numbers together, and all the variables

7a+6(a-4)

We multiply parentheses

7a+6a-24

We add all the numbers together, and all the variables

13a-24

Back to the equation:

-(13a-24)



We get rid of parentheses

-13a+24+15=0

We add all the numbers together, and all the variables

-13a+39=0

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

-13a=-39

a=-39/-13

a=+3

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