a) 7 X - 5 = 867 X = 86 + 57 * X = 91X = 91 / 7X = 13
б) 250 : (y + 7) = 25250 = 25 * (y + 7)250 = 25y + 17525y = 250 - 17525y = 75y = 75 / 25y = 3
в) 46 - Z : 12 = 3846 - Z = 12 * 3846 - Z = 456-Z = 456 - 46-Z = 410Z = -410
a) 7 X - 5 = 86
7 X = 86 + 5
7 * X = 91
X = 91 / 7
X = 13
б) 250 : (y + 7) = 25
250 = 25 * (y + 7)
250 = 25y + 175
25y = 250 - 175
25y = 75
y = 75 / 25
y = 3
в) 46 - Z : 12 = 38
46 - Z = 12 * 38
46 - Z = 456
-Z = 456 - 46
-Z = 410
Z = -410