4.5x+4.5(x-6)=486
    (4-(3/4)*x)/((x-4)^2+(4-(x^2)/4))=((3/4)*x+x/sqrt(16-x^2))/(x*2+(sqrt(4-x^2/4)-2)^2)
    2x＝3(x－1)－35
    4x＋2(35－x)＝86
    9(x－2.4)＝50.4
    4.4x＋0.4＝5.2x
    0.54×x=x-7875000
    9.96*ln(9.3*x)-0.02*ln(x)=19.68
    x^2+1=0
    1/x+1/(x+1)+1/(x+3.5)+(2x+6)/(x^2+6x+13)
    lnx-1/x=8
    1/x+1/(x+1)+1/(x+3.5)+(2x+6)/x^2+6x+13
    sin(107.6+a) = sin(107.6)*e(-a/0.07/3.14)
    2(2t−7)=36
    sin(77.6+a) = sin(77.6)*e(-a/0.07/3.14)
    2h/5+5=3h/5+2
    2y−3=5y+24
    3sin2x=e^x
    x-20=1.2x
    x:(x-20)=1.2

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