30=（x+1)*11-x*10
    5x+2x^2=0.75
    2xxx-3xx+1=0
    4y-3(2y+1)=1-7(3/14-9)
    2/1x-2=4+3/1x
    0.8x=0.7x-1
    x*e^x=5*e^x-5
    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

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