2x^2+5x+2=0 x^2-8x-6=0 10x^2-21x+2=0 7x^2-19x-6=0 12x^2-13x+3=0 4x^2+4x-5=0
    18x^2-21x+5=0 2x^2-13x+5=0 21y^2+13y-20=0 9x^2+6x-35=0
    18x^2-21x+5=0 2x^2-13x+5=0 21y^2+13y-20=0 9x^2+6x-35=0
    20x^2+9x-20=0 3x^2-5x+2=0 3y^2-8y-4=0 15x^2+x-6=0 6x^2-3x-3=0 6x^2-7x+2=0
    2x^2+7x+5=0 8y^2-38y+35=0 8y^2+6y-3=0 20x^2+30x+10=0 3x^2+7x-6=0
    1800/x-400=75000
    7x^2-19x-6=0 12x^2-13x+3=0 4x^2+4x-5=0 4x^2+15x+9=0 2x^2+7x+5=0 8x^2-38x+35=0
    7y^2+8y-80=0
    9x^2-9x-10=0 7y+8y-80=0
    2x^2-13x+5=0 6x^2-3x-3=0 6x^2-7x+2=0 3y^2-8y-4=0 6x^2+19x+10=0
    15x^2+x-6=0
    9/4＝-4/3xarcsin2+3x
    9/4＝-4/3x∧2+3x
    9/4＝-4/3x2+3x
    (2x-6)÷1001+(2x-5)÷1002+(2x-4)÷1003
    2x-6÷1001+2x-5÷1002+2x-4÷1003
    x＾x＾7=196
    e^x
    2(x+5)=88+50+212-2x
    2(x+5)=50+212-2x

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