2х - 4 = 0
2х = 4
2 × х = 4
х = 4 : 2
х = 2
Проверка:
2 × 2 - 4 = 0
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2х - 4 = 0
2х = 4
2 × х = 4
х = 4 : 2
х = 2
Проверка:
2 × 2 - 4 = 0