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a) (x - 12) × 8 = 56
x - 12 = 56 : 8
x - 12 = 7
x = 12+7
x = 19
б) 24 × (z + 9) = 288
z + 9 = 288 : 24
z + 9 = 12
z = 12 - 9
z = 3
в) (y + 25) : 8 = 16
y + 25 = 16 × 8
y + 25 = 128
y = 128 - 25
y = 103
г) 124 : (y - 5) = 31
y - 5 = 124 : 31
y - 5 = 4
y = 5 + 4
y = 9
д) 38x + 15 = 91
38x = 91 - 15
38x = 76
x = 76 : 38
x = 2
e) 44 : z + 9 = 20
44 : z = 20 - 9
44 : z = 11
z = 44 : 11
z = 4
