4.2*13.5-8.7*4.2-5.8+8.7+13.5*5.8=56.7-36.54-50.46+78.3=48
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4.2*13.5-8.7*4.2-5.8+8.7+13.5*5.8=56.7-36.54-50.46+78.3=48