(3x-9)x=-12x
    x=7
    （(4226.11+65.73-X-6139.93)/6139.93)*0.5=((1668.51+64.99+X)-3716.13)/3716.13
    （32+x）*3-（32-x）*4=10
    cosx=0.46
    27.5-[(10-x)^2]÷10 = 10x-(x^2)÷2
    27.5-(10-x)^2=10x-(x^2)÷2
    (0.0000005-x)^2=x
    1.2^x=1500
    12.7%+x+12.7%x = -1.7%
    12.7%+x+12.7%+12.7%x=-1.7%
    24.2%+x+24.2%x=6.4%
    12.7%x+12.7%+x=1.7%
    5x^2-32x+52=6.25（x-5）^2
    5x^2-32x+52=4x^2-40x+100
    （x-4）^2+（2x-6）^2
    5x^2-32x+52=6.25（x^2-10x+25）
    20x^2-128x+208=25x^2-250x+625
    5x^2-32x+52=0
    -50-（100+x）*1%=10

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