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)
5 = n/(-21) // - n/(-21)
5-(n/(-21)) = 0
1/21*n+5 = 0 // - 5
1/21*n = -5 // : 1/21
n = -5/1/21
n = -105
n = -105
| 90=x-2 | | 2(h+1)-h= | | 3=c-22 | | 2-y=-8 | | 64x^2-1=24 | | 3x+7=4x-4 | | m+15=4 | | 90=x/2 | | -1/5x=8 | | 2c=250 | | 2r+3-r+4+5r= | | 8b=480 | | 560=7a | | 12y=288 | | (a/-13)=-4 | | 14x-x=169 | | 4x=232 | | 19-16y+-9=52 | | 2x+3x=28 | | 19=(x/-5) | | 5+2/p=-45 | | 40=x-11 | | 5+p/2=-45 | | 2v^2-v-15=0 | | 746.8=q+400.9 | | p+153.18=315.06 | | 2x+20=x+8 | | n-14.8=10 | | 7.42=m-2.14 | | 19.11=5.16+y | | f/3+7=3(3-2f) | | 805=y+219 |