x-0.7x=3.6
    x+0.1=22
    x+10%=22
    x(x+1)=50
    1-cosx/x
    6a^4-6a^3+5a^2-5a+5=0
    6一3x＝10一5x
    3x一6＝10一5x
    0.75x＝5／4
    2／5：x＝4／15
    ¾x+10＝0
    9m一3（m一10）＝54
    2m＝28一5m
    3/20：1／2＝0.6/x
    9x＋3（2x＋7）＝51
    (1092-240x)/(1092-420x)=3/2
    x^-3
    x*3.22*1.05=3.55
    6x^6-2x^5-120*10^(-4)=0
    x^(-3)

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