21=x(-4)

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Solution for 21=x(-4) equation: 



21=x(-4)

We move all terms to the left:

21-(x(-4))=0



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

x(-4)

We multiply parentheses

-4x

Back to the equation:

-(-4x)



We get rid of parentheses

4x+21=0

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

4x=-21

x=-21/4

x=-5+1/4

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