12*（x-440）=17*（x-200）
    28X²－61x＋18＝0
    22*(x-1160)=17*(x-1100)
    15 x^2+90 x=240
    2*x^3+8*x^2+10*x+6=0
    1/4x^2+15x-2=0
    7/47x^2+13x-2=0
    4*x^3+15*x^2+16*x+6=0
    x^x(1-x)^1-x
    66.67%/x+x=100%
    66.67%/x+x=100%
    0.666667/x+x=1
    x*2.1=3.82
    x*2.1=3.82
    0.666667/x+x=1
    0.666667/x+0.666667/x=1
    8（2y-1）=（y^3+1）^3
    8（2y-1）=（y^3+1）^3
    2（2y-1）^1/3=y^3+1
    2x-3x=0

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