If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
15/60 = 4/X // - 4/X
15/60-(4/X) = 0
15/60-4*X^-1 = 0
-4*X^-1 = -1/4 // : -4
X^-1 = 1/16
-1 < 0
1/(X^1) = 1/16 // * X^1
1 = 1/16*X^1 // : 1/16
16 = X^1
X = 16
X = 16
| D=145 | | 7x8/2*3 | | 5/(4x-5)=1/3 | | 10m+3n-4m+10n= | | -3x+9=15+3x | | 2x^2-20x-884=0 | | 120=-2(4+8x) | | 7x-4(2x-14)=8x+7 | | 27*4+5-4+4y-(3y+5)-(2Y)*7=0 | | x(2x^2-1)=21 | | sec^2x+3secx-15=3 | | 27*4+5-4+4y-(3y+5)=(2Y)*7 | | 132/x=12 | | 248=8(1-6v) | | -25x-15/=-20x-35 | | 3*-5=40 | | 2x-7-3(x-5)=0 | | 7n-3=4m+12 | | 4x^2-88x+420=0 | | 0.008x=1 | | 8(2a+8)=192 | | 7y+3y=31-5 | | xy-10x+18=0 | | 13x+4y=180 | | -2x+6(-3x+9)=146 | | 267-u=215 | | A=.5by | | 253=-v+169 | | 5y=6x+30 | | 6(2m+4)=96 | | -7+3=9x-29 | | -2x+2(3x-13)=-62 |