21(x-4)=14(x+1)
    x^2=x+1
    4x^3-9x+(-3/2)/x
    4xx-12x+9=0
    0.1224x^2-2.031x+7.794=0
    4x^3-9x+(-3/2)/x
    x^3-4x^2-x+6=0
    n²-n=42
    (1/0.7)x - 1/0.03(0.17-0.2x)=1
    2x/0.7-(1.2-x)/0.3=1
    y-(y-1) / 2 = (-2) - (y+2) / 3
    (18-2x)(10-x)=144
    y-(y-1) / 2 = -2-(y + 2) / 3
    (3x+1)/2 - 2 = (3x-2)/10 - (2x+3)/5
    (5x-7)/6 + 1 = (3x-1)/4
    a＝π∧1/5
    （360-2x）*（265-2x）=72000
    (2x+3)/5 + (x-3)/4=(2x+3)/3-(x-3)/2
    3x+2/2 -1 = 2x-1/4 - 2x+1/5
    x-3/2[2/3(x/4 -1)-2] = -2

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