(4/4+n)+10%=9/9+n
    x²+x-96=0
    4x*x-4x+1＝0
    5x+4=5.25x
    5x+4=5.25x
    5x+4=5.25x
    5x+4=5.25x
    6x÷2=27
    12+3x=27
    1-x
    x^2+5=x*(x+1)
    11-x=34-4x
    2X²+4x-21＝0
    10a-a^10+10=0
    1100÷(280+A)=2.2
    1100÷280+A=2.2
    （1-x^10）/（1-x）=1050
    （1-x^10）/（1-x）=100
    3=1/2√2.5*2.5*x*x-(2.5*2.5-x*x-3*3)*(2.5*2.5-x*x-3*3)/2
    3=1/2√2.5*2.5*x*x-(2.5*2.5-x*x-3*3)(2.5*2.5-x*x-3*3)/2

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