200+0.5y+500=y
    0.9956*x - 0.0039=1
    0.9956*x - 0.0039=0.3
    411.52*x - 0.0535=10
    411.52*x - 0.0535=4
    411.52*x - 0.0535=0.4
    411.52*x - 0.0535=0.3
    5x²+30+13x=0
    9X^2-450X+5400=4536
    x(18-x)=80
    (20-2x)(8-2x)-x(8-2x)=56
    (30-x)(20-x)=551
    (37-25-x)(4+2x)=90
    1.95-2*x+0.5x*x=0
    2a^2-5a=10
    （8-t）2+t2=36
    （6-x）（8-x）×1/2=1/2×6×8
    (8-t)*(8-t)+t*t=36
    5x²-13x-6=0
    x²-13x+12=42

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