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    54+35+47-16-13-x+9=80
    7x-3x7=6
    (X-5.861)*200-0.1=5
    (23-x)(400+20x)=8400
    (23-x)(400+20x)=4800
    (58-35-x)(400+20x)=8400
    (23-x)(400-20x)=8400
    2t²-75t+475=0
    x/(94190+x)=12/100
    x(62-2x)=480
    8=x*(x^2+1)^(1/2)
    1/[(x-1)^2]-1-1/x=0
    1*x=1*(x-1)^2-1
    arctanx+arctan0.2x=π/2
    arctanx+arctan0.2x=90
    (x+3)(x-2)-(x+4)²
    (x+3)(x-2)-(x+4)2
    -3.2xx-14x=1.8
    50000×(1+x)^5+50000(1+x)^4+50000(1+x)^3=8496
    50000×(1+x)^5+50000×(1+x)^4+50000×(1+x)^3=8596

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