x^2-672x-560*560=0
    2/x+x/2=1
    55x=45(x+6）
    (15+x)/(29+x)=3/5
    2x+40+x=310
    40x-x²=20
    r^2-2r+2=0
    0.3÷x=1.5
    1/3x^3+3(x2+x+1)
    4x+1/3x×6=360
    3x+8=56
    8x^2--528x=7731
    x^2-66x=1288
    8x^2-528x=7731
    0.5*x^2+30*x+8=1200
    m²＋300m＋20000＝132000
    x∧2＋(3√3-x)∧2=9
    m/2%
    x＋1=2
    m/2%

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