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(160*2.0+X+Y*0.3)*(10-7)/10
=(320+x-0.3y)*0.3
=96+0.3x-0.09y
[160*2.0+X+(Y+160)*0.3]* (10-7)/10
=(320+x+0.3y+48)*0.3
=96+0.3x+0.09y+14.4
[160*2.0+X+(Y+160)*0.3]* (10-7)/10- (160*2.0+X+Y*0.3)*(10-7)/10
=(96+0.3x+0.09y+14.4)-(96+0.3x-0.09y)
=0.18y+14.4
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