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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(1/x) = 0
X-x^-1 = 0
-1*x^-1 = -X // : -1
x^-1 = X
-1 < 0
1/(x^1) = X // * x^1
1 = X*x^1 // : X
1/X = x^1
x = 1/X
x = 1/X
| x^2+38x=215 | | (4x+3)x(x^2-x-56)=0 | | 4x+35=29+2x | | 2x^2-59s+17=0 | | abs(6x)=abs(8x+1) | | -7.1m+9.1+11.4m=-8.3+4.3m+17.4 | | Y=1/2x-1/2 | | mn(m+n)=1 | | R^2-4r+2=32 | | 2/1/2=5n | | x^2-2/3x-3=0 | | 5x+8=x-28 | | 25w^2-5w+22=0 | | 0.07x+0.05y=2040 | | x+3x-20=500 | | 1.7x^2+x-1.5=0 | | -6(3C+5)=156 | | 43-17= | | 2m^2-21=11 | | 0.07+0.05=2040 | | M-5-6M= | | 3N+N=4N | | 8x^2-5=75 | | 3N+N=1 | | m^3+n^3=5 | | 2x^2+3y^2+6x-9y-15=0 | | 2=0.1-x/x2 | | 4X+12-7X+63= | | 1/2(t-6)22 | | 4n-3(4-3)+2(4n-4)+9(5n-2)= | | 4X+12-7X-63= | | X+N=4N |