x+1/x
    x+40=3.5(x-200)
    （x-3)/2+(x-1)/3=4
    40x*0.7=(x-6)*40*0.8
    40x*0.7=(x-6)*40*0.8
    √3x-x=20√3
    6x+10*(50-x)+3=500-78
    6x+10*(50-x)+2=500-78
    1/2022（y+1）+3=2y+4046+2
    6x+10*(50-x)=500-78
    (8-5)x+(3-2)*(50-x)+0.8*(70-x)*(8-5)+[40-(50-x)]*(3-2)*0.8=180
    (8-5)x+(3-2)*(50-x)+0.8*(70-x)*(8-5)+[40-(50-x)]*(3-2)*0.8=180
     √3x-x = 20√3
    √3x-x=20
    √3x-x=20√3
    4x=16
    x^2=9-x
    x(x-1.6)=14.7
    11x-9x=2.3
    25*sin(x)^2-8^(1/2)*sin(x)-4=0

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