а) 42x + 19x - 16 = 1448
61x - 16 = 1448
61x = 1448 + 16
61x = 1464
x = 24
б) 936 : (8x - 17) = 24
8х-17 = 936/24
8х-17 = 39
8х = 39+17
8х = 56
х = 56/8
х = 7