2/3x+50%x=210
    54*x+2/3*x+0.5x+11/12*x+5/12*x+5/6*x=124180
    396000*731=14.3*300*186*（360-186*0.5）+360*x*320
    2x^2-5x=0
    3q^{2}+24q-60=0
    0.2q^{2}+4q-10=0
    x^2=23
    9.5/87-40/1650-40/1000+X/131=0.00167（X+89.5)
    x²-2362x+182873=0
    （5.846-5.846/1.13*0.13+0.13）/6.88=X
    （7.064-7.064/1.13*0.13+0.15）/6.88=X
    （x+2）/(x-2)-16/(x2-4)=1
    8*cosx=3+4sinx
    （1+x）^9=5x+1
    302108.91-238-8816.56-X=（25984.14-499.05-X/1.01*0.01）*1.12
    60.35*60.35*450/3.4*(9-2*x)/(9-x)+0.8*36*(165*2*3.14*30^2/3.4*x*60.35^2/43.85^2+165*2*3.14*20*20/3.4*(9-x)*43.85^2/60.35^2)/(75*450/3.4*9/(9-x)/60.35^2+71*165*2*3.14*30^2/3.4*x^2/43.85^4+71*2*3.14*20^2/3.4*(9-x)^2/60.35^4)=0
    60.35*60.35*500/3.4*(9-2*x)/(9-x)+0.8*36*(165*2*3.14*30^2/3.4*x*60.35^2/43.85^2+165*2*3.14*20*20/3.4*(9-x)*43.85^2/60.35^2)/(75*500/3.4*9/(9-x)/60.35^2+71*165*2*3.14*30^2/3.4*x^2/43.85^4+71*2*3.14*20^2/3.4*(9-x)^2/60.35^4)=0
    x^4+x^3+x^2+x+1=0
    43.85*43.85*1200/3.4*(9-2*x)/(9-x)+0.8*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*32*32/3.4*(9-x)*60.35*60.35/43.85/43.85)/(75*1200/3.4*9/(9-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*32*32/3.4*(9-x)*(9-x)/43.85^4)=0
    43.85*43.85*1500/3.4*(9-2*x)/(9-x)+0.8*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*32*32/3.4*(9-x)*60.35*60.35/43.85/43.85)/(75*1500/3.4*9/(9-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*32*32/3.4*(9-x)*(9-x)/43.85^4)=0

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