3*x^2+22*x+10=0
    x^3+15x^2+50x+30
    2X^2-6x-3=0
    2X^2-6x-3=0
    2X^2-6x-3=0
    2X^2-6x-3=0
    0.507x(50+6.8x)-0.493x(40+8. 2x)=0
    x^3+4*x^2+3*x+2=0
    3.3x-1.2×4=11.4
    46*cos(X)+(sin(x)*sin(x)-cos(x)*cos(x))*(-7.211202495)-2*sin(x)*cos(x)*39.06863364=0
    46*cos(X)+(sin(x)*sin(x)-cos(x)*cos(x))*20.42065651-2*sin(x)*cos(x)*39.06863364=0
    X/20+X/30+X/42=3
    X/20+X/30+X/42=3
    X/20+X/30+X/42=3
    46*cos(X)+(sin(x)*sin(x)-cos(x)*cos(x))*14.47300637-2*sin(x)*cos(x)*42.49889596=0
    1/2*x-5=3*x-2
    2*x^2*3.14-arccos(30/x) / 360 * 2 * 3.14 * x^2 + sqrt(x^2 - 900) * x / 2 = 5800
    （27—x）*6=(23—x)*9
    （2552534-x）/x=-0.8955
    X-X*0.002=14970

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