360/(4x)+3=360/(3x)
    360/4x+3=360/3x
    x+80+0.2x+（1.2x）*13%=2000
    X+X=4
    x^2-2x+1
    x^2-2x+1
    －x(lnx)^2
    X（70+2-2X）=640
    1/x- 2x
    (110.4+x)/(102468.15+x)=2%
    (110.4+x)/(102468.15+x)=10%
    3800x−200−200x=0
    3800*x-200*(1+x) = 0
    3800*x-5000*(1+x)*0.04=0
    (5600-1800)*x-5000*(1+x)*0.08*(1-50%)=0
    5=-4k
    2.3=(x＋3.8)÷(13.2-x)
    (2x-5):(3x+5)=3:7
    0.9x+0.8x+0.8=102.8
    0.9x+(x+1)*0.8=102.8

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