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)
7/x = 49/63 // - 49/63
7/x-(49/63) = 0
7/x-7/9 = 0
7*x^-1 = 7/9 // : 7
x^-1 = 1/9
-1 < 0
1/(x^1) = 1/9 // * x^1
1 = 1/9*x^1 // : 1/9
9 = x^1
x = 9
x = 9
| 13x-5x=64 | | q=-2p+20 | | 5.2(3+5x)-1.6=14 | | -4x-19=-9x+1 | | 5(-7)-x(12)= | | 102=2 | | 5(-7)-(-7+12)= | | 11x-14=10x-9+2x | | X+13=28+5 | | 6y+3=x | | 5(-7)+7(12)= | | 3(325)=5Q+185 | | 7x+76=x+4 | | 5y=89 | | 111x-32=31+8x | | 8x=89 | | 4z+9=19 | | 6x+120-4x=120 | | 12a-84=10a-65 | | 12sin^2X-3=0 | | 2cos^2+5cos-3=0 | | 6a-4a+6=64 | | 2.5x-1.4=1.5x+.6 | | 5Q=-793 | | l+(25-l)=25 | | (6x+5)(3x^2-20-7)=0 | | (6x+5)(3x-20-7)=0 | | 0.1667x=-.75x | | f(x)=3sin(2x-1)+pi | | 5-7(6x+8)=4 | | 9b(2b-4)= | | 15+32=4-13y |