( 2k - 3 ) ( k + 5 ) = 7k
    2x ( x - 3 ) = 10
    ( m + 8 )²= 8²+ 80
    ( x - 7 ) ( x + 5 ) = 160
    x^2+4x=0
    x*(5.78408E8-740206.32)=(740206.32+x)*(5.78408E8+x)
    x-4=6
    sin(x)+x-1/x=0
    （180-519.6x）(0.94-0.342x)+73.6-984.8x=0
    1.1*4.9(6.75-0.143x)^2=79.8
    1.1*(33.08-0.7x)(6.75-0.143x)^2=79.8
    x^2-x＝1000000000
    (33.08-0.7x)(6.75-0.143x)^2=79.8*1.1
    (33.08-0.7x)(6.75-0.143x)^2=79.8
    cos(x)=(cos(0.5)-1)/(1-0.1cos(0.5))
    tanx=5/π
    x-0.1sin(x)=0.4523165
    x3-15X-4=0
    d^3+4*d^2+5*d+3=0
    x*1.3=3.76

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