1/x²-1
    9-（4-x)=2
    1=x
    (1/4)x+(3/4)((1-4)x)+24=x
    9-（4-x)=2
    (1-1/11)X=152-X-5
    x*1.15*1.66*1.3=4.32
    x*0.65*1.15*1.66*1.3=2.81
    (1-5/9)X+8=3/4 X-3
    11%＝0.6×（1＋g）/12＋g
    0.6y+y=0.72
    16*9.8*t+9.8*t*t＝4
    6y+y=0.72
    66y+y=0.72
    66y+y=0.72
    66y+y=0.72
    0.6y+y=0.72
    0.6y+y=0.72
    0.6y+y=0.72
    0.6y+y=0.72

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