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(a - z²b) / z² = c /b
a/z² - b = c +b
a/z² = c+b /a
1/z² = (c+b)/a
z² = a / (c+b)
z = pierwiastek z a / (c+b)
a=z²c+z²b
a=2z²+c+b
-2z²=-a+c+b /:(-2)
z²=-a+c+b /2
z=√-a+c+b /2
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