60 + x = 90
x = 30
60 + 30 = 90
x − 8 = 10
x = 18
18 − 8 = 10
решение 2
x + 8 = 48
x = 40
40 + 8 = 48
48 − x = 8
48 − 40 = 8
60 + x = 90
x = 30
60 + 30 = 90
x − 8 = 10
x = 18
18 − 8 = 10
решение 2
x + 8 = 48
x = 40
40 + 8 = 48
48 − x = 8
x = 40
48 − 40 = 8