If it's not what You are looking for type in the equation solver your own equation and let us solve it.
n in (-oo:+oo)
(4/5)*n+7 = 15 // - 15
(4/5)*n-15+7 = 0
4/5*n-8 = 0 // + 8
4/5*n = 8 // : 4/5
n = 8/4/5
n = 10
n = 10
| 3x+15+5x+15=22 | | 4/7t+6=54/7 | | -4/5+5d=-179/5 | | 4/9+b=2/3 | | -1/3k+3/4=-1/4 | | 6m-1=-7/2 | | -1/7d+2/7=10/7 | | -7/10+1/6t=-1/5 | | 5p+7=(4-p) | | 2b+6=-16 | | 1/9+1/4x=29/18 | | -1/4a-2/3=-43/48 | | 4/7k-3=-37/7 | | 1/4n+4/7=-5/28 | | 3/4w+4=7/4 | | -2/5w+1/3=22/75 | | 2x-6+7=1 | | 2/5x+3=27/10 | | 1/2k+2/3=14/3 | | 6+5t=26 | | 2-1/3a=7/3 | | 1/3b+6=71/12 | | 4+3/7k=117/28 | | 5x+25+2x=16-5x-3 | | 7d+2/3=169/33 | | -2/3m+8=202/27 | | 3a-6=-7 | | -8-1/3m=-25/3 | | 2/7+m=4/7 | | 1/3a+8/9=-10/9 | | 1/2d+2=9/2 | | 4x=7-x+3x+15 |