220=2a-4(5-7a)

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Solution for 220=2a-4(5-7a) equation: 



220=2a-4(5-7a)

We move all terms to the left:

220-(2a-4(5-7a))=0

We add all the numbers together, and all the variables

-(2a-4(-7a+5))+220=0



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

2a-4(-7a+5)

We multiply parentheses

2a+28a-20

We add all the numbers together, and all the variables

30a-20

Back to the equation:

-(30a-20)



We get rid of parentheses

-30a+20+220=0

We add all the numbers together, and all the variables

-30a+240=0

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

-30a=-240

a=-240/-30

a=+8

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