-7x=-x(x+7)

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Solution for -7x=-x(x+7) equation: 



-7x=-x(x+7)

We move all terms to the left:

-7x-(-x(x+7))=0



We calculate terms in parentheses: -(-x(x+7)), so:

-x(x+7)

We multiply parentheses

-x^2-7x

We add all the numbers together, and all the variables

-1x^2-7x

Back to the equation:

-(-1x^2-7x)



We get rid of parentheses

1x^2+7x-7x=0

We add all the numbers together, and all the variables

x^2=0

a = 1; b = 0; c = 0;
Δ = b2-4ac
Δ = 02-4·1·0
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{0}{2}=0$

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