-20=-2(a-2)

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Solution for -20=-2(a-2) equation: 



-20=-2(a-2)

We move all terms to the left:

-20-(-2(a-2))=0



We calculate terms in parentheses: -(-2(a-2)), so:

-2(a-2)

We multiply parentheses

-2a+4

Back to the equation:

-(-2a+4)



We get rid of parentheses

2a-4-20=0

We add all the numbers together, and all the variables

2a-24=0

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

2a=24

a=24/2

a=12

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