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)
16/20 = 4/x // - 4/x
16/20-(4/x) = 0
16/20-4*x^-1 = 0
-4*x^-1 = -4/5 // : -4
x^-1 = 1/5
-1 < 0
1/(x^1) = 1/5 // * x^1
1 = 1/5*x^1 // : 1/5
5 = x^1
x = 5
x = 5
| 2w+3=20 | | 6+17=3y-10 | | 0.8*100= | | 26/9=130/x | | -66+17=3y-10 | | 237-Y=46 | | 4b+18=24 | | ln(7x-8)=5 | | 5y-x+7=0 | | [q-4]*2=4 | | y=-1.4x+6.7 | | 6x+5(x+37)=97 | | 238=199-Y | | -8(v+2)=-5(v+2) | | 2.5m-8.5=6.5 | | 80x+15= | | 3+-3u=18 | | 238=119-Y | | 9a-6=3-18a | | 7200=36000/x | | x+(x*.165)=10000 | | 5x+3=-8+4x | | -X+72=271 | | 3x^2-3=2x^2+51 | | 3a+2b-2a+4-6= | | q-12=-3 | | 202=-X+272 | | P=3a+2b+c | | 14-3w=2 | | -7x+15+3x=-9x-90 | | [9-4]*2=4 | | 10(x-4)=9*5 |