-90-arctan0.1x-arctan0.2x = -135
    -90-arctan0.1x-arctan0 2x=-135
    x ^3+12x ^2+44x+50=0
    x ^3+12x ^2+44x+50=0
    x ^3+12x ^2+44x+50=0
    2x^2-3x-2=0
    12000／x十9000／1.5x＝150
    2x+(5-2x)=5
    (X-10)*0.4=X*0.36
    (X-10)*0.4=X*0.351
    2*X²-0.5*X
    －X²＋22X＝120
    25x+40（1000-x）＝34000
    -0.5x^2+2x+1.5=0
    (100+x)(1200-2x)=245000
    x[1200-2(x-100)]=245000
    (100+x)×(1200-2x)=24500
    120000-200x+1200x-2x^2=24500
    3m-m^2=-4
    1/2x+3=-1/3x-2

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