x÷3=8.3
    x/3=8.3
    2.7 = 10^(11.76-2x)+10^(2.76-x)+10^(50.86-3x)+10^(67.36-5x)+10^(90.56-6x)+2*10^(41.52-5x)
    X+X=557150
    X+X/360*14=557150
    12.08x^3+82.69x^2-9.96x-1145.88=0
    0.66+1.36*x*(5.62+0.95*70) = 0.9+1.36*0.06*70
    x*e^2x+2x^2*e^2x-x-1=0
    （1+x）^5=1.28
    165.8566-0.0524934x=167.7353-(x-7)/4
    arctanx+arctan(0.5*x)=45
    x^3-x^2+x+4=0
    165.8566+0.0524934x=167.3285-(x-7)/4
    arctan1
    arctan0.5
    sin30
    0.66+1.36*0.08*(5.62+x*70) = 0.9+1.36*0.06*70
    0.66 + 1.36 * 0.08 * (5.62 + x*70) = 0.9 + 1.36 * 0.08 * 70
    x-1+sqrt(1-x^2)=sqrt(2)-sqrt(2-2*x^2)
    -1/x÷x^4=0

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