sinx/x
    100x=x+183.15
    x+2=10
    x+200=7x+14
    x²-6x-7=0
    x²-6x-7=0
    x²-6x-7=0
    x²-6x-7=0
    x²-2x-3=0
    x²-6x+5=0
    x²-x-6=0
    x²-5x-6=0
    x²+7x+6=0
    （40-t）^0.75=0.27×（t-30）
    x（x－1）（x－2）（x－3）＝360
    x＾4－6x＾3＋11x＾2－6＝360
    (6350-X）/X=0.8
     （2300+85+X）*6.05%=（360/180）*X
    50 = 5.833x - 6.998
    50 = 5.999x - 6.66

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