15 (13x-7) = 285 решите

1)

15 * (13 * x - 7) = 285,

15 * 13 * x - 15 * 7 = 285,

195 * x - 105 = 285,

195 * x = 285 + 105,

195 * x = 390,

x = 390/195,

x = 2.

2)

15 * (13 * x - 7) = 285,

Разделим на 15.

15/15 * (13 * x - 7) = 285/15,

1 * (13 * x - 7) = 19,

13 * x - 7 = 19,

13 * x = 26,

x = 26/13,

x = 2.