24n^2-18n-36=0
    6 * x ^ 3 - 60 * x ^ 2 ＝ 2000
    4x^4-900x^2+18225=0
    2.4+x=4.8
    76.8（1+x）=120
    x^2-225x+2025=0
    21%=18%+（18%-6%）*x
    21%=18+（18%-6%）*x
    160*s^5-4999*s^4+3*s^3+1=203432473249548452727132664826436383243201908517690636940099562959081337763668549114573536919544242454086151986984869713987779579271968836632090426294561904292513625686316100599724432620359228903
    4x+8＝114514
    x^2+36-12xcos(70)+x^2+64+16xcos(70)-2cos(70)sqrt((x^2+36-12xcos(70))(x^2+64+16xcos(70)))=196
    cos（x）=1.4/1.5
    x²/x+1
    5（x-7）=2.5
    0.03x^2－2.06x+28＝0
    0.3x＋20÷3x＝0.95
    （2x+1）÷2=6x-2
    (x-3)/10=4x
    x-3
    -4082750+3000000+X-X*10%/4-450000=300000

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