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-7

3 - 3 × 3 - 3 ÷ 3 (Simplify the Division)

= 3 - 3 × 3 - 1 (Simplify the Multiplication)

= 3 - 9 - 1 (Simplify the Addition by adding negative values)

= 3 - 10 (Simplify the Subtraction and apply the greater value sign which is negative)

= -7

B for bracket,

O for Order/Of,

D for Division,

M for Multiplication,

A for Addition,

S for Subtraction

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