2x+8/x
    ((x*10+5)/10*256)/256 = 26.89
    ((x*10+5)/10*256)/256 = 8
    ((x*7+5)/7*256)/256=8
    10x+0.8*2*x=560
    4x+0.8*x=190
    t=564391542349
    2(x-1/8)^2+1343/64
    (x+2)^2-1
    15-(7-5x)=2x+(5-3x)
    8x^2+10x+20=18
    t(108-t^2)=30468155
    1.25x^2=225
    e^x=1-x^2
    x＝35.8sinx
    3=x*cos(x)
    128x∧2+254x+128＝608
    128（1+x）∧2＝608
    128（1+x）（1+x）＝608
    x^4+x^2-100=0

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