y*（54.8+77.976+66.3）-（77.976+66.3）*759.2+66.3*1843.7+479.5*174.68/2+1294.8*72.41/2=0
    0.72*x*2=3.2
    x*2.12*2=3.2
    k√（4k＋1）＝（k＋2）²
    （75660-2.5X）*9.6/20.6*0.9=21159+8X
    1.696x∧2+14.264x+72=0
    tanx+x=0
    2*（x^3）+21*（x^2）+60*x+40 = 0
    2*x*x*x+21*x*x+60*x+40=0
    x^2-28x+180=0
    3x-5=(x-5)×5
    2y-1/4=1-(3-y/8)
    k^2+6k+9=0
    7/5y-4/5y=-4+9
    1/k²-3+2（k+1）=7
    6k²-4k-10=0
    k^2+8k+7=0
    20000I²-600I+9=0
    x+x*6%=103882.82
    8x^2-300x-1400=0

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