60÷{2•[-7+18÷ (-3+12)]} - [7•(-3) -18÷ (-2)+1]
60÷{2•[-7+18÷(9)]} - [7•(-3) -18÷(-2)+1]
60÷{2•[-7+2]} - [-21 +9+1]
60÷{2•[-5]} - [-11]
60÷{-10}+11
-6+11
5
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60÷{2•[-7+18÷ (-3+12)]} - [7•(-3) -18÷ (-2)+1]
60÷{2•[-7+18÷(9)]} - [7•(-3) -18÷(-2)+1]
60÷{2•[-7+2]} - [-21 +9+1]
60÷{2•[-5]} - [-11]
60÷{-10}+11
-6+11
5