evaluate (16÷81×-9÷20) - (2/5÷3/2)
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(16/81×-9/20) - (2/5÷3/2)
(4/9×-9/20) - (2/5×2/3)
(-4/20) - (4/15)
(-1/5) - (4/15)
[(-1×3)-4]/15
(-3-4)/15
-7/15
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