5(2x – 1) = 8x + 15(2x – y) = 8x + 1 5(2x – y) - 8x – 2(x + y) 5(2x – 1) = 8x + 1х = 3 x(х 2 – 7) = 6 -2, -1, 0, 2, 3
Имеет ли корни уравнение: 2x + 3 = 2x + 8; 2у = у; |х| = -5; (х – 5)(х – 6) = 0; х 2 = 4.
Равносильны ли уравнения: 7(x – 3) = 49 и x – 3 = 7; 2х – 7 = 0 и 2х = 7.