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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20/x-2 = 10/x // - 10/x
20/x-(10/x)-2 = 0
20/x-10*x^-1-2 = 0
10*x^-1 = 2 // : 10
x^-1 = 1/5
-1 < 0
1/(x^1) = 1/5 // * x^1
1 = 1/5*x^1 // : 1/5
5 = x^1
x = 5
x = 5
| 4/5+k=22/15 | | t/6=-4/7 | | 7=d+7 | | n+5/8=29/8 | | k+6/7=55/7 | | 19/2=t-1/2 | | k+7=15 | | k+7/9=-83/9 | | d/3=4 | | t+7/10=77/10 | | 75/8=w+9 | | -1+n=-9/5 | | a-3/5=32/5 | | 1/3+a=14/33 | | -6=k-7 | | -19/2=x-9 | | x+4=13/4 | | 7/10+t=11/10 | | -1+k=9 | | d-2/9=43/9 | | w+5/8=53/8 | | a+3/4=43/4 | | b+3=9 | | w-5=-11/2 | | b+5/6=91/66 | | k-9/10=11/10 | | k-8=-8 | | w+2/5=53/45 | | t+3/8=35/8 | | 1+b=1 | | 3/10+m=83/10 | | x-1=-5/9 |