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)
(6/7)*x-3 = -87/7 // + -87/7
(6/7)*x-(-87/7)-3 = 0
(6/7)*x+87/7-3 = 0
6/7*x+66/7 = 0 // - 66/7
6/7*x = -66/7 // : 6/7
x = -66/7/6/7
x = -11
x = -11
| -3+5x=-7/9 | | -3+5x+3/7x=81/49 | | -3+5t=7t-8/3 | | -3+5n=-13/11 | | -3+5k=57 | | -3+5d=-36/7 | | -3+5d=-38 | | -3+5b+1/2b=-17/2 | | -3+5/6m=-3/5m-167/70 | | -3+5/6b=-193/66 | | -3+5/6a=-3 | | -3+4n+6/7n=-93/14 | | -3+3w+1/7w=-118/21 | | -3+3m=30 | | -3+3k-1/2k=9/2 | | -3+3/7w=-39/14 | | -3+3/7t+5t=17/7 | | -3+3/5n+1/2n=-4/5 | | -3+2x=-2/3x-4 | | -3+2x=-6x+93 | | -3+2x-5x=-12 | | -3+2x+6/7x=179/7 | | -3+2a-3a=-24/7 | | -3+2/7n=-89/28 | | -3+2/5x=-3/5 | | -3+2/5d+3/7d=-366/35 | | -3+2/5a=1 | | -3+2/3x=-5/2 | | -3+2/3w+5/7w=8/7 | | -3+2/3w+3/7w=-155/21 | | -3+2/3m=5m-22/3 | | -3+2/3m=1/2m-28/9 |