50-5p=-10+5p
    (360-x-280)(5x+60)=7200
    x²-340x+2400=0
    x^3+3x^2+4x
    0.3x+（-0.23）*（1-x）=0.04
    5/6X-1/6=1/8
    5X-1.4X=14.4
    30%*x+（-23%）*（1-x）=4%
    2(5+36+x)=88.4+200-2x
    1.6（1＋X）＝2.5
    x
    3151.114-2985.506+(1-b)*157.316=322.924-b*157.316
    6x=18
    6.37*x/（x-6.37）=7.97
    (0.6x)^2+(0.8x+sqrt(x^2-16x+80))^2=(4sqrt(5))^2
    (4-0.8x)^2+(3-0.6x+5)^2=x^2-16x+80
    (4-0.8x)^2+(3-0.6x+5)=x^2-16x+80
    -432= (2x-3)^3*(x+2)^4
    48=(2x-3)^3*(x+2)^4
     x+4.5=0.67×x

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