tan(x)-x
    【（220+220）*63-X】*0.85+8*63=21679.45
    X/126-(92-X)/1000=0.238
    2=A×3.1%/360×90+A
    （x-x/40）+70 = 8500/0.95
    x^2+22x+9=0
    0.5x+3.5=5x-8.5
    0.5x+3.5=5x-8.5
    -(53√5 +22)(x+6)/382=-x^2/4-x+3
    x^2+41x-86=0
    x^3-6x+1=0
    x^3-5x+1=0
    x^3-4x+1=0
    x^5-15x^4+85x^3-225x^2+274x-120=0
    17x^3-307x^2+1783x-3301=0
    10X-63等于X
    cosx=3/2－sqrt2sinx
    2x减4乘（10减x）= 8
    120000+150x＝250x
    (X+9)/X=4

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