Mathematics
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    -6+m=-6÷m
    -6+m=-6÷m
    x+2x+3x+4x+5x+6x+7x+8x+9x+10=55
    4/3x+7/5=2/11x+8/13
    1234567x+7654321=2345678x+8765432
    555555x+777777=444444x-999999
    8x-4x^2-4
    2800/126-X/1000=0.00381(2800+X)
    2400/126-X/1000=0.00381(2400+X)
    √(x^2+4)-x
    (400-x)(8+0.08x)=5000
    (400-x)(8+0.8x)=5000
    (20+2x)(15-2x)+246=300
    x^4-5x^2+4=0
    x^2-√(x^2)-2=0
    x^2+x-2=0
    e^x+x=7
    ex+e-x
    8^X=2
    350×(1+x)×(1十X)=504

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