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    80+X=575-450+25%X
    7x²-25000x=7320
    80+X=575-450+25%X
    arctg2
    arctg2
    arctg2
    (8*x+60)/5-(7*x-10)=10
    arctanx+arctan2x=-90
    arctanx+arctan2x=-90
    arctanx+arctan2x=0
    arctanx+arctanx=0
    x^2=438.85×(1-x)
    (x-2)(2x-5)=0
    5+x/9+x=3/5
    27+x=25+x
    27x=25x
    arctanx+arctan2x=-90
    x²-x=0
    x*0.13+x*x=101.3
    x*0.13+x*x=101.3

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