2x + 30 = (300 - 44) / 42x + 30 = 256 / 42x + 30 = 642x = 64 - 302x = 34x = 34 / 2x = 17
Ответ: x = 17.
2x + 30 = (300 - 44) / 4
2x + 30 = 256 / 4
2x + 30 = 64
2x = 64 - 30
2x = 34
x = 34 / 2
x = 17
Ответ: x = 17.