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(y+4)/5+y+6=(y+8)/2-(y+4)/3 乘以30得6(y+4)+30y+180=15(y+8)-10(y+4) 6y+24+30y+180=15y+120-10y-40 6y+30y-15y+10y=120-40-24-180 31y=-124 y=-4
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