-1=7a(-4)

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Solution for -1=7a(-4) equation: 



-1=7a(-4)

We move all terms to the left:

-1-(7a(-4))=0



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

7a(-4)

We multiply parentheses

-28a

Back to the equation:

-(-28a)



We get rid of parentheses

28a-1=0

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

28a=1

a=1/28

a=1/28

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