3(5x + 2) > x - (3x - 23)15x + 6 > x - 3x + 2315x + 6 > -2x + 2315x + 2x > 23 - 617x > 17x > 1.4(x + 8) - 7(x - 1) = 124x + 32 - 7x + 7 = 12-3x = 12 - 32 - 7-3x = -27x = 9.3x² - 27 = 03(x² - 9) = 0(x - 3)(x + 3) = 0x = -3; 3. 5x² - 4 = 0(x√5 - 2)(x√5 + 2) = 0x = -2/√5; 2/√5.x² - 1 < 0(x - 1)(x + 1) < 0 + -1|||||||||-||||||||||||1 +------------0-------------------0-----------> xx ∈ (-1; 1).