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)
(0.8-(0.3*x))/x = 0
(0.8-0.3*x)/x = 0
0.8-0.3*x = 0 // - 0.8
-0.3*x = -0.8 // : -0.3
x = -0.8/(-0.3)
x = 2.66666667
x = 2.66666667
| 7=10-3r | | 180x+2.50=100 | | 3(x-5)+x=33 | | Sin32=5/x | | 10(s-10)=199 | | 6(log(4x))=18 | | 3/5y-4=2 | | 12(3-2x)=84 | | -2x+2=-5x+29 | | 78=6.5z | | 7w=24+w | | 6log(4x)=18 | | 9(4g-3)= | | d/-73 | | -2x-2=5+5x | | 11(n+3)+3=3 | | 7/8*3 | | 5x+5r-2x+r= | | -2x+10=-5x+10 | | 3k+4=7 | | 4(2g-5)= | | 4/9*2 | | 0x=-7y | | -5.5X^2+198=0 | | -2.8=a+3.1 | | -6p+48=12 | | 10+5x=-5x+60 | | Ln(5x+4)=ln(3-x) | | 6x-3(2x+5)=8 | | 4st+3-2ts+6s= | | 5n+8=53 | | 5-3x=2x+45 |