ln(2x)=(4-2x)^（1/3）
    (lnx)^3+x=4
    x²＋3x²
    （40减x）乘15=（60减x）乘9
    （40减x）乘5=（60减x）乘9
    40减x乘5=60减x乘9
    a^4+4a^2-32＝0
    a^4+16a^2-32＝0
    a^4+16a^2+6a-32＝0
    a^4-8a^2+6a-32＝0
    a^3-138a^2+4680a-32400=0
    49.272x^2 + 595.56x + 0.7763=464
    49.272x^2 + 595.56x + 0.7763=1160
    49.272x2 + 595.56x + 0.7763=1160
    49.272x^2 + 595.56x + 0.7763=504
    49.272x^2 + 595.56x + 0.7763=0
    49.272x2 + 595.56x + 0.7763=0
    （16一2x）（9一x）=98
    x-1
    （x-180）*(1-25%)/1500=(x-180-4000*8%)/1000

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