13*x^2/9+4*x/3-21/4=0
    0.6x^3-0.52x^2+21x-58=0
    106×7.93+12.18x=（106+x）×7.965
    104×7.93+12.18x=（104+x）×7.97
    x^3+5x^2+10x+12=0
    3x^2+10x+4=0
    3.5x^2-12x-5.5=0
    3.5x^-12x-5.5=0
    3.5x^2-11x-5.5=0
    0=-8（0.5+a）+28
    3.5x^2-11x-7.5=0
    3x^2+8x+5=0
    3x^2+4x+2=0
    x²+5x-2250=0
    (x-360)[160+2(480-x)]=20000
    2x^3+26.1x^2+80.4x+4=0
    x^3+4x^2-x+20=0
    (12962-X*0.03/1.03)*1.12=229000-X
    （25-2x）（40-2x）=450
    2254725*((1+x)^-30) = 750000*((1+x)^18 )

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