2(x²+4)＝5x
    2(x²+4)＝5x
    9x^2-9x+2=0
    Tan
    85*x+90*(25-x)=25*88.08
    3.5567*120+25x=145*3.6
    15.34*（1-x^16）/（1-x）=1369
    15.34*（1-x^16）/（1-x）=1369
    99.38*（1-x^17）/（1-x）=11346
    6.39*（1-x^9）/（1-x）=124.65
    6.18*（1-x^7）/（1-x）=71.21
    61.78*（1-x^16）/（1-x）=5775
    16.47*（1-x^16）/（1-x）=2469
    29.25*（1-x^16）/（1-x）=3782
    29.25*（1-x^16）=3782
    x^2+(2x)^2=400
    526.67x∧2－460x∧2－662400+110400x+28274.7x－2827470＝43239849.12－33261.4x
    3234.16x²+2568.13x-1021.6＝0
    x+1=2
    x+1=2

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