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2x² + 5x² - 2x + 10(2x - 1) = 0
2x² + 5x² - 2x + 20x - 10 = 0
4x + 25x - 2x + 20x - 10 = 0
4x + 25x - 2x +20x = 0 + 10
47x = 10 /: 47
x = ¹⁰/₄₇
b) x(x² - x + 3) = 3
2x² - 2x + 3x = 3
4x - 2x + 3x = 3
5x = 3 /: 5
x = ³/₅
Chyba dobrze ;P