(7%-X)/(X-8%) = (4.1002-4)/(4-3.9927)
    2x∧3－7x∧2＋2x＋3>0
    2x∧3－7x∧2＋2x＋3＝0
    950 +950*0.025 +950*0.035 -(950+x) -(950+x)*0.05-(950+x)*0.035<0
    950 +950*0.025 +950*0.035 -(950+x) -(950+x)*0.025-(950+x)*0.035<0
    x=3>0
    x^2+2x-2>0
    .09/1.15=.02/x
    2.87/0.036=x/0.028
    4.13/0.036=x/0.028
    4.13/0.036=0.028/x
    4（2x-1）<3（3x-5）
    3x-25<8x+11
    ((1+0.035)^x-1)-0.04x>0
    1.2^x>6
    72p^3-72p^2+36p-25≥0
    2x-1／x+1≥0
    37.39/33.82=x/40.97
    40.97/x=33.82/30.26
    x∧2+x+1≥0

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