4-2[6*3]/9+1
4 - 2[6*3]/9 + 1
Order of operations:
PEMDAS: Please exuse my dear aunt Sally:
Paranthesis, exponents, multiplication (*) & division (:), addition (+) & subtraction (-).
4 - 2(6*3)/9 + 1 =
4 - 2(18)/9 + 1 =
4 - 36/9 + 1 =
4 - 4 + 1 =
1