2^x+x=0
    3(x^2)-12x+32/5=
    3(x^2)-12x+6.4=
    x^2-2x+3.6=
     120（x+10）-100x=2800
    i-7%/8%-7%=（2.6087-2.6243）/（2.5771-2.6243）
    85=X-87+X-86
    30/(2.7*sqrt(1+2.7^2/25)*sqrt(1+2.7^2/100))*x=1
    2.27=9.9/(9.9-X)
    (X+3)-(2-5x)=-5
    X²+3X+282=0
    0.7X+0.7X×6÷4×1.2=527602
    (25-X)*(-500X+20000)=0
    3.14/(sqrt(1-(0.78)^2)x)=1
    e(-3.14*x/(sqrt(1-x^2)))=0.02
    (2*x+0.466)*1.5+2*1.803*(x*(x+0.466))^0.5=1.2
    (2*x+0.466)*1+2*1.414*(x*(x+0.466))^0.5=1.2
    (2*x+0.466)*0.75+2*1.235*(x*(x+0.466))^0.5=1.2
    (2*x+0.466)*0.5+2*1.118*(x*(x+0.466))^0.5=1.2
    （2*x+0.466）*0.25+2*1.031*(x*(x+0.466))^0.5=1.2

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