5x4-5x3-33x2+3x+18÷5x2-3
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5×4=20
-5×3=-15
-33×2=-66
3x
18÷5×2=1.8
-3
20-15-66+3x+1.8-3
=-71+3x+1.8-3
=-74+1.8+3x
=-72.2+3x
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