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potrojona liczba m to 3m
liczba o 13 mniejsza od potrojonej liczby m to 3m-13
3.
(2x - 3)(4y + 2) = 8xy + 4x - 12y - 6
4.
x(7x² + 2x + 4) - 7(x³ - x² + x + 2) = 7x³ + 2x² + 4x - 7x³ + 7x² -7x - 14 = 9x² - 3x - 14
x = -2
9 * (-2)² - 3 * (-2) - 14 = 9 * 4 + 6 - 14 = 36 + 6 - 14 = 28