If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
13 = x+1 // - x+1
13-x-1 = 0
12-x = 0 // - 12
-x = -12 // * -1
x = 12
x = 12
| x+3/5=58/5 | | 1/4x=-1/12 | | x-1/5=-3/10 | | x-2/5=13/5 | | x+5/8=33/40 | | x-2=-13/10 | | x-5/6=49/6 | | x/6=5/6 | | x+4/5=-21/5 | | 1+x=-10 | | -23/44=x-1/4 | | -68/9=x-5/9 | | 6x=24/11 | | 4/5=x+4/5 | | -7+x=-10 | | 3p-6=p-8 | | x-5=-44/9 | | 3+x=21/8 | | 19/7=x+3 | | x-3=-9/4 | | x-9=-77/8 | | x-5/7=5/42 | | x+4=7/2 | | 7x=49/9 | | 1+x=12 | | x-7/10=113/10 | | x-1=-2/9 | | 1/6x=7/66 | | x-9=-41/5 | | x+1/7=-83/7 | | x+7/9=131/99 | | x+10=51/5 |