14281.3*300+312.4*4000+1485.4*x-130.1784*50000=585802.8
    14.2813*300000+312.4*4000+1485.4*x-130.1784*50000=585802.8
    14.2813*300000+0.3124*4000000+1.4854*x-130.1784*50000=585802.8
    14.2813*340000+0.3124*5000000+1.4854*x-130.1784*48000=585802.8
    =(14.2813*340000+0.3124*5000000+1.4854*x-130.1784*48000)=585802.8
    4x²-x-1
    √X+1
    0.049*sinx/cos（x-5）+0.01*(1+sinx)=0.048
    0.259*sinX/cos(X-5)+0.01*（1+sinX）=0.19
    (x²-2x²-7)²=(x²-2x+1)²
    4x-8=2x+6
    2*x^3+21*x^2+50*x+30=0
    3*x^2+10*x+6=0
    x-x²=1/4
    cosx=0.9067sinx
    cosx=0.75sinx
    3*x*x＋18x＋14＝0
    x+x*10%=810
    x+x*10%=79
    (5.0152^x)/(!(x))=150.6867532

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