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 = 105/x // - 105/x
15-(105/x) = 0
15-105*x^-1 = 0
-105*x^-1 = -15 // : -105
x^-1 = 1/7
-1 < 0
1/(x^1) = 1/7 // * x^1
1 = 1/7*x^1 // : 1/7
7 = x^1
x = 7
x = 7
| (x/2)^2-4=0 | | -5(1-5x)=5(-8x-2) | | 6x-4x=7x-9x-6 | | -2n/3-2/3=12 | | 15s=14s+8 | | 10x+9-4x=3x-4 | | 28x-36=25x+6+48 | | (a+3)(9a+8)= | | A=h/2(c-d) | | 4.91e+5=CM | | -29=n-1 | | 3x-15-21=24 | | -5(p+2)=-p-8-3p | | 7-3(4x-2)=6(2x+3)-17 | | 1+(-3)*(-3)= | | (3-v)(5v-6)=0 | | 2x^2-33=33 | | x^8-50= | | (Y+3)(y+6)=0 | | 4(y-4)+2(y+2)=12 | | 1-4x^2= | | 5u^2+52u+63=0 | | 6a^2-36a=0 | | 104=3x+16 | | 5x+29(x-4)=88 | | Z^2=16x | | 12x-9x=33 | | 5x-33=7x-21 | | -7+-7=-14 | | c=nxd | | x^2-28x+187=0 | | X^2+4=2(3x-6-x)+x^2 |