Y＝20＋0.8Y＋100＋80
    1.6×（1+x）=2.5
    138x²－126960x＋14500000=0
    （360-X）/(396-X)=0.4939
    （360-X）/(360*1.1-X)=610*1235
    3x+1=23
    x²-870x+1051072=
    87.5+125x-22.5x^2=240
    22.5x^2-80x+184=0
    xcosx-sinx+π=0
    (19-60/(6+2x))*x*6.4+148=1.6((19+60/(6+2x))*(6+x)+10)
    (81.54-8x)*0.5885+10=1.2((81.54-8x)*0.4226+4.23x)
    (81.54+8x)*0.5885+10=1.2((81.54+8x)*0.4226+4.23x)
    x÷(e^x-1)
    4a^2=（6-a）^2+64
    179(0.961-0.276x)(0.891-0.454x)+443(0.891-0.454x)+336=1.4(211(0.961-0.276x)(0.891-0.454x)+620(0.891-0.454x)-60)
    x*1770099000=x*3074264000*(1+0.75*1304165000/1770099000)
    12000-438.8x+3000*0.785*x^2*(0.8/x)^(1/3)=30000
    x=11000-2000-120-(0.2x+424)+(0.21x+212)-550
    (0.2x+424)+(0.21x+212)=8966

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