x/(1-6%) +(833-x)/(1+5%)=830 x/0.94 +(833-x)/1.05=830 左右同时乘以0.94*1.051.05x+0.94*833-0.94x=830*0.94*1.050.11x=0.94(830*1.05-833)0.11x=0.94*38.5x=0.94*38.5/0.11x=0.94*350x=329