x-0.6x=(6-0.1x)
    lnx * 1000 +500 = lnx/3 * 1500
    x+x*0.05+（x+x*0.05）*0.09=3599904.25
    Japan Airlines
    2x-2=x/2+4
    lnx/(x²－1)
    4+3x-（4-3x）
    （3x+2）/4-（x+4）/6=1
    3x²＋x＝108
    x+（2√10-x）²=5
    x-10+x+1+0.5*x+2*x+2=4x
    33+（x-20)0.7 = 0.65x
    33+（x-20)0.7 = 0.6x
    33+（x-20)0.7 = 0.7x
    33+（x-20)0.7 =0.75x
    44.8+（x-20)1.1 = 60
    33+（x-20)0.7=40
    5-1-2*10/3(t-15/4)=2
    sin（2πx/5）=
    33+（x-20)0.7=0.8x

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