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
    14/3
    x÷5=24
    10000(x/4+1)=x(x+1)(x/100+1)(x/400+1)
    20log(x/0.775)=4
    1.004492^12
    3r^3+r^2+18r+12
    3r^3+2r^2+18r+12
    7t^3+7t^2-t-1
    7t^3-7t^2-t-1
    13.569706256544502617801047120419‬=tan[[(-2.16*x)^2-1]^0.5]
    13.569706256544502617801047120419‬=tan[((-2.16*x)^2-1)^0.5]
    13.569706256544502617801047120419‬=tan(((-2.16*x)^2-1)^0.5)
    xx(0.04xx+1)(0.0004xx+1)=100
    arctan(13.569706256544502617801047120419‬)=((-2.16*x)^2-1)^0.5
    xx(0.04xx+1)(0.0004xx+1)=10
    xx(0.04xx+1)(0.0004xx+1)=1
    20lg(x/0.775)=4

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