a)
N + 7 = 18 subtract 7 from both sides
N = 11
b)
N - 6 = 24 add 6 to both sides
N = 30
c)
5N = 45 divide both sides by 5
N = 9
d)
N/6 = 7 multiply both sides by 6
N = 42
e)
4N + 3 = 19 subtract 3 from both sides
4N = 16 divide both sides by 4
N = 4
