115000*x+60400*（1-x）=101325
    x² +0.8600175x -0.00000000170625 =0
    0.5142*ln(300)+0.0262*300-265/8.314+x/300=0
    12*x+4000=14x
    14x+8400=7x+319200
    x^2-0.00044x+1.6*10^（-6）-1.08*10^（-10）=0
    -69/8.314/300+4.2610+0.0108*300/2+x/300=0
    0.8*1.2X-200=X-440
    （2x-1）∧3=-8
    （2x-1）∧3
    2sin(x)+2sin(x)
    4x^2=54.4（0.2-x）^2
    0.25x-x+12=0
    -263.2/8.314/300=0.5142+0.0262*300/2+x/300
    1.96*10^-(5)*x^5+15.97*x-244.898=0
    －3*x*x*x*x-4*x*x*x+2x*x-4*x-3
    m^2-150m+3600=0
    m^2-150m=3600
    m^2+150m=3600
    9t^2-132t+424=0

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