-0.5xx+50x=1050
    arctan(0.5x)-90-arctan(x)-arctan(x/10)-arctan(x/20)=-180
    arctanx=45
    1+10/(Z-1)+(10*Z-10)/(9*Z-0.0004086)-(Z-1)/(90*Z)=0
    1332.909443*(1-(1+r)^-10)=10000r
    2/3*(3+√17)^2/4+2(3+√17)-1/3(3+√17)^3/8
    2409.75*(1-(1+r)^-5)=10000r
    （1-x）（4-x）（5-x）+4+x=0
    lgx=0.2
    30*140*0.004492/0.800817
    1-0.199183145293404
    (1/1.004492)^360
    1/（x-6）-4=1/（x+6）+3
    -5x3+9x2+16x-28=0
    119.905294+140
    arctan(16.3)‬=[(-2.16*x)^2-1]^0.5
    144.666666666666*15*0.055255895991467
    2500x+10000=x(x+1)(0.01x+1)(0.0025x+1)
    arctan(13.569706256544502617801047120419)‬=[(-2.16*x)^2-1]^0.5
    x^2-5/4x+9/64=0

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