(X-60)(220-2X)＝1050
    (X-60)*(200-2X)＝1030
    112.8=（（0.021*x^1.85+1603）^0.5）*x^0.84
    （26.326+x）×2.55＝71.278+52.652-x
    （26.326+x）×2.35＝71.278+52.652-x
    （26.326+x）×2.15＝71.278+52.652-x
    （26.326+x）×1.95＝71.278+52.652-x
    （26.326+x）×1.75＝71.278+52.652-x
    （26.326+x）×1.55＝71.278+52.652-x
    （2x-1）÷3=x-2
    0.8(x-2)+5.6=48-3.2(x+5)
    5x-39-3x=6-7x
    10x-11=4x+25
    81-7(2x-3)=18
    6x-2(x-4)=24
    (26.326+x)×1.55＝52.652+71.778-x
    (26.326+x)×1.75＝52.652+71.778-x
    (26.326+x)×1.95＝52.652+71.778-x
    (26.326+x)×2.15＝52.652+71.778-x
    (26.326+x)×2.35＝52.652+71.778-x

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