7x+56=16
    x^2 -149.5x + 80 * 69.5 - 5.8 = 0
    90-arctanw-arctan0.5w=60
    （5500×12×0.9-70%×145X×6.4%）÷（30%×145X+5%×145X）=3.8%
    (-0.076221--0.098005)/0.003=(x--0.098005)/0.002437354
    (-4.673798+3.897610)/0.003=(x--3.897610)/0.002437354
    -x^(2)-2x+11=0
    (-4.673798-3.897610)/0.003=(x--3.897610)/0.002437354
    x^(2)-2x+11=0
    (-4.673798-3.897610)/0.003=(x+3.897610)/0.002437354
    (-4.673798-3.897610)/0.003=(x+3. 897610)/0.002437354
    (-4.673798-3.897610)/0.003=(x-3.897610)/0.002437354
    (1.707513-1.696923)/0.003=(x-1.696923)/0.002437354
    -5x-1=-x+2
    (2.415027-2.393846)/0.003=(x-2.393846)/0.002437354
    1000/(200+x)=2.439
    (2.13835-1.88726)/0.003=(x-1.88726)/0.002437354
    -7x-2=-x
    1000/（1+17%）
    5.6sin(3x)=4.8

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