75+х=90 80-к=42 6× n=54

Question

75+х=90 80-к=42 6× n=54

Answer 1

1) 75 + x = 90
x = 90 - 75
x = 15

2) 80 - k = 42
-k = 42 - 80
-k = -38
k = 38

3) 6n = 54
n = 54/6
n = 9