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-140=5(4a-4)

We move all terms to the left:

-140-(5(4a-4))=0

We calculate terms in parentheses: -(5(4a-4)), so:We get rid of parentheses

5(4a-4)

We multiply parentheses

20a-20

Back to the equation:

-(20a-20)

-20a+20-140=0

We add all the numbers together, and all the variables

-20a-120=0

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

-20a=120

a=120/-20

a=-6

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