1,5*4200*(40-y)=0,5*2100*(y-(-10) 6300*(40-y)=1050*(y+10) 252000-6300y=1050y+10500-7350y=-241500/:(-7350)
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1,5*4200*(40-y)=0,5*2100*(y-(-10)
6300*(40-y)=1050*(y+10)
252000-6300y=1050y+10500
-7350y=-241500/:(-7350)