x^2-5x+5=5x-20

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Solution for x^2-5x+5=5x-20 equation: 



x^2-5x+5=5x-20

We move all terms to the left:

x^2-5x+5-(5x-20)=0

We get rid of parentheses

x^2-5x-5x+20+5=0

We add all the numbers together, and all the variables

x^2-10x+25=0

a = 1; b = -10; c = +25;
Δ = b2-4ac
Δ = -102-4·1·25
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{10}{2}=5$

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