2(X^2)-3X-1=0
    2*X^2-3X-1=0
    2X^2-3X-1=0
    25^2-20^2=X
    X^2=576
    25^2-7^2=X
    10^2+80-16X+X^2=10^2+X^2
    56X+2X(52-2X)=640
    56X+104X-4XX=640
    x²+2x＝3
    x²+3x＝3
    6r-r^2=8
    （√6+√2-x）²+（√6+√2）²=√2x²
    √x*x+（√6+√2-x）*（√6+√2-x）=2√3+2-√2x
    -x+3=-x2-2x+3
    -2x^2+480x-25600=1400
    Kigviij
    ｛（2√2）+2｝x∧2+｛-2-（2√2）｝x+√2=0
    1/3+（1/x+1/60)*24=1
    2/(x+10)=1.2/(x-10)

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