0.5/x=1.5
    X+X*0.03=40000
    x^2-48x+7.645=0
    x^2-48+7.645=0
    x^2-48+7.645=
    x^2-48x+7.645=0
    x*2.99*1.05=3.55
    7(7(5x/7-5)/5-1)/3=5x
    k-(k-(k-1)/2)/2=2(k-1)/3 ((((x+2)/3+4)/5+6)/7+8)/9=1
    (5y+1)/6-(1-3y)/5=(9y+1)/8-(1-y)/3 1-(x-(1+x)/3)/3=x/2-(2x-(10-7x)/3)/2
    40(3x-6)-12(10x-16)=8(15x-12)-5(12x-66) 3(2x-3)-(3-2x)/3=5(3-2x)+(2x-3)/2
    7(2x-1)-3(4x-1)-5(3x+2)+1=0
    x/（15000+x）=0.25
    1.25＝（25-15）Q÷（25-15）Q-1500-2700
    x+2cosx
    x（1+1%）=328
    x-x*0.07=5720
     x^2-sinx*cosx = 3.1435
    x^2-sin(x)*cos(x)=3.1435
    x^2-sinx*cosx=0.003456

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