Odpowiedź:
3x + 7x + 5 = 10x + 5 => 10 *3 + 5 = 35
8x + 7x +2 = 15x +2 => 15 * 3 + 2 = 47
-3x + 4 + 2x = -x + 4 => -3 + 4 = 1
9x - 7 - 4x + 3 = 5x - 4 => 5 *3 - 4 = 15 - 4 = 11
7 + 5x + 4 - 6x = 11 - x => 11 - 3 = 8
