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-z²b = z²c - a
-z²b - z²c = -a
z²b + z²c = a
z²(b + c) = a
z² = a/(b+c)
z = √a/(b+c)
2)az²-bc=c(z²+a)
az² - bc = cz² + ca
az² - cz² = ca + bc
z²(a - c) = ca + bc
z² = (ca + bc)/(a - c)
z = √(ca + bc)/(a - c)
b)z= pierwiastek z (z2*a)/c-b