10（x+3）+x=xx
    x（x+8）=128
    2x∧2+4x
    3x- 1.3x+5x- 2.7x=-12×3-6×4
    (x-1)/2-(2x-1)/3=x+1
    x-1/2-2x-1/3=x+1
    5=5-3x
    X- 5=1
    4x^2 -x-9 =0
    （x+2）×（10-x）＝40
    x^2+5.8x-1=0
    27x-9x^2＋10＝28
    x^6+100.01x^4+x^2-100=0
    (x - 1)(x + 1)
    450/x-450/x+5=1
    1/3(x+7)=2/5-1/2(x-5)
    3x-3=3
    3(20-y)=6y-4(y-11)
    -3x-5=3
    -5-3x=-x

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