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    (280-x)/x=105/140
    a(40-2a)=150
    a(40-2a)
    x/(x - 2) + 2/(x - 4) = (4x - 12)/(x ^ 2 - 6x + 8)
    9/4+x^2=81
    (1-55%)x=90
    2x∧2+6x+14=18
    2x∧2+6x+14=18
    2x∧2+6x+14=18
    (2+x)*x=60
    2x+x²=60
    360x=200
    188x=123
    y=5^2+9
    a=2+1/a
    a=2+1/a
    a=2+a/1
    (17/223)*h^2-52*h+2666.68=0
    x-(x*0.2)-10=50
    x-(x*0.15)-5=50

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