x+0.15x=42
    4099990*0.97-x=1005555.26
    tana=tanπ/5
    5-6q＋6q²=0
    180+arctan(20/x)-90-arctan(20/60)-arctan(88*20/x)-arctan(20/12.588)=35
    (50-x)∧0.75=0.1924(x－31)
    -1.04194=(1/x)*ln(1-x)
    X−X÷300×40=2499
    0.3790/（3.3401-x)+1.0672/(2.5417-x)+0.3748/(1-x)+0.0386/(0.4199-x)=0.12
    (50-x)∧0.75=0.3(x－31)
    ㏒K=20.27
    (54.4-x)∧0.75=0.397(x-31)
    (54.4-x)0.75=0.397(x-31)
    0.75x=100+x
    90x/60=x
    2x*45=60x
    2x*45
    500（1+x）=720
    x^2+5=25
    4 x+3=39

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