If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( r )
8*r-10 = 0
8*r-10 = 0
8*r-10 = 0
8*r-10 = 0 // + 10
8*r = 10 // : 8
r = 10/8
r = 5/4
r in (-oo:5/4) U (5/4:+oo)
(4*r-(6*r)-12+3)/(8*r-10) = 0
(4*r-6*r-12+3)/(8*r-10) = 0
(-2*r-9)/(8*r-10) = 0
-2*r-9 = 0 // + 9
-2*r = 9 // : -2
r = 9/(-2)
r = -9/2
r = -9/2
| -2x-91=-10x-13+2x | | 26+8r=-3(9r-2) | | -150=30-30r | | -3x-1=-2x | | 6+-5=6(x-5) | | 2v=7.36 | | 7x+78=-7x-6 | | -150=-30r-30 | | 26q=-390 | | 952=s+257 | | 3x+2y+9x+y=180 | | 3(12-3y)-y=6 | | p+102=873 | | -3y=57 | | 30r=150-30 | | m+26=96 | | n(n+1)+(n+1+1)=27 | | -9(3.24)-8= | | (-2r-9)/(8r-10) | | 3d+3=2d-7 | | 8p^2-20p=3+3p | | 1x+11=46x+2 | | 4x+14+2x=32.5 | | 1/2u-3/5=-3u-6/5 | | 1.30(x)+1.60(x)=755 | | 5m+2n=4 | | 11/3-5/3(7x+13/7)=-8527/84 | | 1k-40=7+-1k | | 3q=966 | | -v-4/3=7/3v+1/5 | | b^2+16bg+60g^2= | | n+262=330 |