If it's not what You are looking for type in the equation solver your own equation and let us solve it.
k in (-oo:+oo)
9-7*k = 7*k-117 // - 7*k-117
9-7*k-(7*k)+117 = 0
9-7*k-7*k+117 = 0
126-14*k = 0 // - 126
-14*k = -126 // : -14
k = -126/(-14)
k = 9
k = 9
| -6-b=-4b-18 | | -10+6b=7b-19 | | -4b+5=38+7b | | 7x-2=40-7x | | 5x+7=2x-17 | | 2n+10=8+4n | | 10+3t=-6t-44 | | 5t-7=-4t-97 | | 4w+2=3w-9 | | -7-6n=n+7 | | -6+7n=-3n-66 | | -9+3d=-5d-81 | | -n+5=7n-11 | | -6t+6=5t-38 | | 7(w-91)-20=1 | | -2w+10=7w+37 | | t-9=-18+2t | | k-2=7k-38 | | 5a+10=4a+14 | | k+10=-8+7k | | 4k-6=-14+3k | | g-90/-3=-2 | | x+2(x-30)=90 | | -8+5x=-4x-89 | | 7m+3=4m+39 | | -9+2d=5d-9 | | -7w+6=-75+2w | | -7t-2=-50+t | | 6+6x=2x+10 | | 2/1-x=5/1+x | | 4n+5=5n-1 | | 14.5y-9=8.4 |