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)
91/55 = 6*x+3*x-(4/5) // - 6*x+3*x-(4/5)
91/55-(6*x)-(3*x)+4/5 = 0
91/55-6*x-3*x+4/5 = 0
27/11-9*x = 0 // - 27/11
-9*x = -27/11 // : -9
x = -27/11/(-9)
x = 3/11
x = 3/11
| -x+1/5-4/5x=101/55 | | 7+6m+5m=18 | | 1301/441=-4t+3/7t-1/9 | | 3/7m+3+2m=106/7 | | 3m+9/10+m=107/30 | | 11/7=2k+1/7k+8 | | n-5/6+n=-19/66 | | -151/10=-w-2/5w+3/10 | | -1/4m+3+4m=111/22 | | 4m+3/7-4/7m=65/21 | | 4+2k+3/7k=155/77 | | 19/5=2n-5n+5 | | -1/3m-3/4-3/4m=-55/108 | | 1/3m-1/9+1/3m=-19/36 | | 1=-4n+7n-2 | | 10+1/2b+b=67/6 | | 54/11=5k-6k+4 | | 250+30+50+40+17+50+5+10+10+10+15+25+89+45+2= | | y/3=9 | | -4/7t+9-1/2t=261/14 | | 2m+8+m=46/5 | | a-1/3+3a=1/15 | | 2/7w+4/9-4/5w=361/630 | | -a+2/7-2a=128/7 | | 5n+10+2n=13 | | 7+7a+2a=10 | | 9/10+4b+1/2b=-243/5 | | 7d-2/5+3d=398/5 | | 5x+4/7-7x=18/7 | | 4/5-7t+1/5t=-234/5 | | 4+5/7w+3/4w=265/56 | | -4/5+7x-6x=-67/40 |