6.38*1.04^x=1.567
    1.04^x=1.567
    X/2+2
    X^20=170
    -20x²+820x+24400=0
    0.68299/3+1=(300/(x+300))/(300/(x+564.55))
    -20x²+800x+25620=0
    0.68299/3+1=(300/x)/(300/(x+564.55))
    7.2/411+1/30+(0.4*144)/2354=9457/x
    -x²
    x÷4×15=5/6
    x÷4/15=5/6
    4*t∧3-26*t∧2+50*t-21
    (2.78x)/(1400+x)＝0.667
    (2.78x)/(1400+x)＝1.667
    x+1/x-1
    9/411+1/30+42/1177=11457/x
    9/411+1/30+92/2354=11457/x
    1015.91=X+X*5/10000*18
    x*x-x-2070

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