5x+x5=x
    x^3-7x^2+42x-270=0
    200／x＝4×200／x＋0.6
    （0.4+x）×x÷（0.4-x）＝0.0102
    760.27*x^3＝11200*x+4928000
    x^2(x-3)=20240114
    0.73+149.92+83.2+165.93+5.795x^2+77.5x-77.44-97.70-52.89-99.49-17.92x^2-79.62x
    0.73+149.92+83.2+75.74+5.155x^2+7.217x+96.138-77.44-97.70-52.89-48.62x-21.47x^2
    0.73+149.92+83.2+5.155x^2+54.54x-77.44-97.70-52.89-48.62x-21.47x^2
    0.73+149.92+5.505x^2+21.47x-77.44-97.70-68.5x-19.535x^2
    1/x²=
    0.73+149.92+5.505x^2+21.47x-77.44-121.37-68.5x-19.535x^2
    0.73+149.92+5.505x^2+21.47x-77.44-121.37-68.5x-19.535x^2
    0.73+149.92+5.505x^2+21.47x-77.44-121.37-68.50x-19.535x^2
    0.73+149.92+5.505x^2+21.47x-103.15-75.36-68.50x-19.535x^2
    0.73+5.14x^2+2.10x-103.15-75.36-24.7x-11.95x^2
    0.73+5.14x^2+2.10x-103.15-75.36-24.7x-11.95x^2
    0.73+5.14x^2+2.10x-103.15-75.36-24.7x-11.95x^2
    x：4=1.5:0.2
    4x－2.5x=1.05

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