a²-16a-80=0
    a²-16a-80=0
    （7.36-7.36/1.13*0.13）/7.08=X
    （7.21-7.21/1.13*0.13+0.15）/7.08=X
    220000×（1+x）^3-220000=15510
    11074.15=（220*63-x）*0.95+8*63
    （26.307+x）×0.85＝52.613+67.72-x
    （26.307+x）×0.85＝52.613+68.72-x
    （26.307+x）×0.85＝52.613+69.72-x
    （26.307+x）×0.85＝52.613+70.72-x
    （26.307+x）×0.85＝52.613+71.72-x
    （26.307+x）×0.85＝52.613+72.72-x
    11169.15=（220*63-x）*0.95+63*8
    （8-2x）^2+（9-2x）^2＝4x^2
    x＋x²＝36
    x∧3＝6×x＋7
    791-x+(480-x)*2/3=1010
    0.42=-2×(x-0.5)²+0.5
    x/1.2+2=x+3/1.25
    x+55=x*6

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