x＝12-250+165×12+1500
    x＝12-250+165×12+1500
    x＝12-250+165×12+1500
    x＝12-250+165×12+1500
    400×x-（160+8）x+1500
    400×x（160+8）x+1500
    0.15X+X=197
    125=-16X*X+105X
    x－0.08x＝253
    x-（x*0.08）＝253
    sinx×sinx=49/65
    sinx×sinx=49/65
    4sinx+7cosx=0
    4sinx+7cosx=0
    2sinx—3cosx
    4sinx+7cosx=0
    4sinx+7cosx=0
    x＾4+x+1
    x=2^9
    x/(1+200/100)-x/(1+230/100)=300

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