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    (x-3/0.2)-(x+4/0.5)=1
    x^2-0.3947x+0.0627=0
    (x-3/0.2)-(x+4/0.5)
    x-3/0.2-x+4/0.5=1
    95=x^2+0.5x
    2(x+6)=13.6
    (300-10x)(10+x)=3750
    50x-80(x+300)=69500
    5x=572570
    114514x=1919810
    9x²-sinx-1
    920x-x²=137530
    18x=cosx
    18x=cosx
    x^5+x^4+x^3+x^2+x+1=0
    18*x^2+100*x-63=0
    3.989x=690946458576875687368705687586508657665897
    3*x^2+20*x-3=0
     x*0.4+73*0.2+90*0.4 = 87
    x*0.4+73*0.2+90*0.4=8.7

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