e^x=2
    x^4+x^3=24
    5*x=1
    x*e^x=5*x-5
    36.4(5+x)=210+33.6
    30x+40(50-x)=1650
    42x+40(50-x)=1650
    42x+40(50-x)=2100
    42x+50(50-x)=2100
    15x+2=9x+20
    0.02×x＝4×0.05×x
    0.02x＝4×0.05x
    0.5(x+1.2)+1.5x=1
    103.83s^2=182983.92
    103.83s^2+18135.8793=0
    （1157.4k^2-22215.132k-182983.92）/（256.28-6k)
    （1157.4k^2-22215.132k-182983.92）/（256.28-6k）=0
    （461343.96+45186.45k+1221.1548k^2）/（323.07+17.06k）=0
    4199.625s^2=185
    （1923230+943094k-51543k^2）/（3846.46-190.9k）=0

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