28=3(a+2)+7(8+2a)

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Solution for 28=3(a+2)+7(8+2a) equation: 



28=3(a+2)+7(8+2a)

We move all terms to the left:

28-(3(a+2)+7(8+2a))=0

We add all the numbers together, and all the variables

-(3(a+2)+7(2a+8))+28=0



We calculate terms in parentheses: -(3(a+2)+7(2a+8)), so:

3(a+2)+7(2a+8)

We multiply parentheses

3a+14a+6+56

We add all the numbers together, and all the variables

17a+62

Back to the equation:

-(17a+62)



We get rid of parentheses

-17a-62+28=0

We add all the numbers together, and all the variables

-17a-34=0

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

-17a=34

a=34/-17

a=-2

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