-28=5(4-2a)+7(2-3a)

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Solution for -28=5(4-2a)+7(2-3a) equation: 



-28=5(4-2a)+7(2-3a)

We move all terms to the left:

-28-(5(4-2a)+7(2-3a))=0

We add all the numbers together, and all the variables

-(5(-2a+4)+7(-3a+2))-28=0



We calculate terms in parentheses: -(5(-2a+4)+7(-3a+2)), so:

5(-2a+4)+7(-3a+2)

We multiply parentheses

-10a-21a+20+14

We add all the numbers together, and all the variables

-31a+34

Back to the equation:

-(-31a+34)



We get rid of parentheses

31a-34-28=0

We add all the numbers together, and all the variables

31a-62=0

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

31a=62

a=62/31

a=2

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