Mathematics
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    1/3-2x
    50(x-2)+170=55(x-1)
    siny=-3y/2+3π/4
    siny=-3/2y+3π/4
    arctanx-2arctan0.3x
    arctanx-2arctan5x
    (x+1)(x+7)=1
    x^2+2x-1=0
    12000(1-x)^2=7680
    12000(1+x)^2=7680
    (x+50)(600-10x)=15000
    (x+50)(600-50x)=15000
    x=1.2×(339/60)2/(2×(3.14×0.42)2)
    2=100×(x-339)÷(x×1350÷100)
    (x+2)(x+2)-25=0
    (x+2)(x+2)=0
    s^3+7s^2+10s+6=0
    3/4x+3/10=2/5
    tanx-x=10
    tanx-x=10

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