12=12x-3x^2

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Solution for 12=12x-3x^2 equation: 



12=12x-3x^2

We move all terms to the left:

12-(12x-3x^2)=0

We get rid of parentheses

3x^2-12x+12=0

a = 3; b = -12; c = +12;
Δ = b2-4ac
Δ = -122-4·3·12
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{12}{6}=2$

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