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
    x^2-150x+360=0
    7x²＋2x-5
    2(5+x+22)=50+20+212-2x
    2(5+x+22)=50+212-2x
    104.4+（22－x）*4.3＝（50+6.5x）/1.5
    0=0.44-((1+x)/x)*0.12*0.4
    (x+2)÷3=2x
    (x+2)÷3=2x
    (x+2)÷3=2x
    (x+2)÷3=2x

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