（1+30%）X=4.55
    X^6-7X^5+8X^4+33X^3-30X^2-63X-27=0
    X^2=5
    2x+3=2
    100+x=(170+x)×0.618
    （16-x）×（160+40x）=3840
    2x+5=25-8x
    6x^2-11x+3=0 6x^2-15x+6=0
    2x^2+7x+5=0 8y^2+6y-3=0 4x^2+15x+9=0 2x^2-5x+3=0 5y^2-21y+18=0 15x^2+x-2=0
    2x^2-3x-20=0 4x^2+24x+7=0 6x^2+x-35=0 2x^2+5x+7=0 6x^2-9x-6=0 5y^2-8y-13=0
    2x^2+5x+2=0 x^2-8x-6=0 10x^2-21x+2=0 7x^2-19x-6=0 12x^2-13x+3=0 4x^2+4x-5=0
    18x^2-21x+5=0 2x^2-13x+5=0 21y^2+13y-20=0 9x^2+6x-35=0
    18x^2-21x+5=0 2x^2-13x+5=0 21y^2+13y-20=0 9x^2+6x-35=0
    20x^2+9x-20=0 3x^2-5x+2=0 3y^2-8y-4=0 15x^2+x-6=0 6x^2-3x-3=0 6x^2-7x+2=0
    2x^2+7x+5=0 8y^2-38y+35=0 8y^2+6y-3=0 20x^2+30x+10=0 3x^2+7x-6=0
    1800/x-400=75000
    7x^2-19x-6=0 12x^2-13x+3=0 4x^2+4x-5=0 4x^2+15x+9=0 2x^2+7x+5=0 8x^2-38x+35=0
    7y^2+8y-80=0
    9x^2-9x-10=0 7y+8y-80=0
    2x^2-13x+5=0 6x^2-3x-3=0 6x^2-7x+2=0 3y^2-8y-4=0 6x^2+19x+10=0

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