9 - 3 / (1/3) + 1 = ?
Turning into fractions to make mathematical procedures easier.
(9/1) - (3/1) / (1/3) + (1/1) = ?
Apply PEMDAS (Parenthesis around fractions are only to define them clearly)
(9/1) - (3/1) * (3/1) + (1/1) = ?
(9/1) - (9/1) + (1/1) = ? [Re-writable to: 9 - 9 + 1]
0 + 1 = 1