x(1-x^18)/(1-x)=91.43448481
    50x+40×(50-x)=2100
    x²-1
    log(10,40/101325)=6.354-5567/x-0.5log(10,x)
    9x^2-8x-12=0
    2x²－16x=8
    x＋x÷11.3＝97330
     X^3-2.41×208.1234^2-（27.08-8.45×0.0001×208.1234^2）×X^2=0
    ((8)/(x-2))=((4)/(2x))+1
    ((8)/(x-2))=((4)/(2x))
    ((8)/(x-2))=((4)/(2x))+1
    ((8)/(x-2))=((4x)/(x-2))
    e^(3.18*x)*sin(x-17.44) = sin(-17.44)
    ((8)/(x-2))=((4x)/(x-2))
    X^3-2.41×243.0335^2-（27.08-8.45×0.0001×243.0335^2）×X^2=0
    x^2-4=0
    2.88+0.4x=13.28
    8/x-2=4x/x－2
    −540000x(900x+180000)3−1800x2(900x+180000)3+2x(900x+180000)2+300(900x+180000)2
    4（x-4)-（x+3)=10

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