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    x÷75%=80
    2x-3=56
    x^2-6x+8=0
    0.99*0.99*0.97
    x+2=2x+7 x=?
    0.98*0.98*0.85
    1+3x/2>2x-1
    x-3/2(2x-1)≤4
    X∧3+2X-4
    x^2-48x-720=0
    1-2(x-1)≤3(x+1)+5
    3q^2-40q-400=0
    3x-1<2x+1
    (1-q^10)/1-q=10
    (1-q^2)/1-q=8
    (1-q^3)/1-q=12
    1/2-1≤7-3/2x
    3x-2>x+2
    (1-q^10)/1-q=40
    x^2+16x/3+124/25=0

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