1) 48 : (65 - x) = 12;

65 - x = 48 : 12;

65 - x = 4;

x = 65 - 4;

x = 61.

2) (127 - x) : 4 = 24;

127 - x = 24 * 4;

127 - x = 96;

x = 127 - 96;

x = 31.