X + 13 = 28X = 28 - 13X = 15
20 - X = 12X = 20 - 12X = 8
X - 11 = 79X = 79 + 11X = 90
10 + X = 28X = 28 - 10X = 18
Таким образом, решения уравнений:
X + 13 = 28
X = 28 - 13
X = 15
20 - X = 12
X = 20 - 12
X = 8
X - 11 = 79
X = 79 + 11
X = 90
10 + X = 28
X = 28 - 10
X = 18
Таким образом, решения уравнений:
X = 15X = 8X = 90X = 18