If it's not what You are looking for type in the equation solver your own equation and let us solve it.
t in (-oo:+oo)
3*t+5 = -13 // + 13
3*t+5+13 = 0
3*t+18 = 0 // - 18
3*t = -18 // : 3
t = -18/3
t = -6
t = -6
| 4/7b+8=12/7 | | 5/7t+8=173/21 | | -5/6a-1=-7/2 | | -1/7-2x=-8/7 | | -1/7d+4/7=-4/7 | | 6/7d+2/5=194/35 | | 7w+1/5=-139/5 | | -4/9+a=10/99 | | 4/5m+8=42/5 | | -1/7-2a=25/21 | | 2/5b+1/3=-11/3 | | -4/7n-3=27/7 | | 5/7d-7=-569/77 | | -4/7+1/3b=-221/252 | | -2/5+6x=-92/5 | | 4-1/6d=95/24 | | 3/4+6/7n=45/28 | | 7/9-5/6n=13/36 | | 3/7d+9=66/7 | | -1/6b-8=-527/66 | | 5/7d-1/3=-172/21 | | w-8=-15 | | 3-4m=1 | | 2b+5/6=17/6 | | 3-x/8=-2 | | 1/5n+1/4=9/20 | | -7w+8=78 | | 6/7m-1/3=-151/21 | | 1/2+7x=-11/6 | | -2/5x-1=-7/10 | | 4/5b+4=21/5 | | 1+4x=-1/2 |