(300-10a)(40-a)-(800-20a+5a)=11350
    (300-10x)(40-x)-(800-20x+5x)=11350
    (300-10x)(40-x)-(800-20x+5x)=11350
    x^2-48x=2128
    1/(x-2)-(2x)/(x^2-4)=2/(x+2)
    1/x-2-2x/x^2-4=2/x+2
    （x+1）∧2＝1
    （1+x）∧12＝1.03
    sqrt（（7.7/2）^2+（5.35/2）^2）=x
    4x+68=388
    log(10,x)=(√2)/2+1
    4 x+68=388
    （1/2x+8/8x+1）（4+8/8x+1）=4+（8/（8x+1））^2
    （1/2x+8/8x+1）（4+8/8x+1）=4+（8/8x+1）^2
    （1/2x+8/8x+1）（4+8/8x+1）=4+（8/8x+1）^2
    （1/2x+8/8x+1）（4+8/8x+1）=4+（8/8x+1）^2
    （1/2x+8/8x+1）（4+8/8x+1）=4+（8/8x+1）^2
    （1/2x+8/8x+1）（4+8/8x+1）=4+（8/8x+1）^2
    （1/2x+8/8x+1）（4+8/8x+1）=4+（8/8x+1）^2
    （1/2x+8/8x+1）（4+8/8x+1）=4+（8/8x+1）^2

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