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)
(1/21)*x^(-1/21)*(20-(41*x)) = 0
(1/21)*x^(-1/21)*(20-41*x) = 0
1/21*x^(-1/21)*(20-41*x) = 0
( 1/21*x^(-1/21) )
1/21*x^(-1/21) = 0 // : 1/21
x^(-1/21) = 0
x należy do O
( 20-41*x )
20-41*x = 0 // - 20
-41*x = -20 // : -41
x = -20/(-41)
x = 20/41
x = 20/41
| 27-9x=14 | | -4y-8=8y+100 | | -22-3x=-2x+x-3X | | -5=4x-3x | | 4w+5=5w-6 | | .5(2x+4)=3x-4 | | 4(8-x)=2x+16 | | -63+3y+8=2(5y-3)-7 | | 8n+11=10n-11 | | 2(x-5)=15x-4x | | x+(x*.0975)=4.21 | | .3x+1.4=4.2-.1x | | 4m+4=10m-62 | | -7/10m=-1324/24 | | 4+17n-3=9n+85-47 | | 100/900=85/x | | Y=-2x^3-2x^2+60x | | ax-2cx+4ay-8cy= | | 18-8-2=.5(18-2) | | -27+3*27=27+27 | | -u+106=240 | | c-3=2-3 | | 2-4-3-4=4 | | 267=158-u | | 2d+2=3d-4 | | Y=-1/4-4-5 | | 10-6*-3=2(-3-3) | | 27+9w=12w | | 2d+3=3d-4 | | 10-6x-3=2(-3-3) | | 5.2+1.2n=1.84 | | 10u=54+u |