If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
(2/5)*a+7*a-(3/7) = -2087/35 // + -2087/35
(2/5)*a+7*a-(3/7)-(-2087/35) = 0
(2/5)*a+7*a-3/7+2087/35 = 0
37/5*a+296/5 = 0 // - 296/5
37/5*a = -296/5 // : 37/5
a = -296/5/37/5
a = -8
a = -8
| -2/7t+1/5+7t=-649/280 | | -1/3-5/7a+1/4a=-257/420 | | 76/7=2k+3k+8 | | 1/8-1/5b-3/5b=-179/360 | | 1/3d-1+d=-20/9 | | 7=x+4x+7 | | -7+5n+1/2n=59 | | 4+2d-2/7d=100/7 | | 6t+1+4t=-109 | | -181/24=-2/3a-7a+1/8 | | -31/7=-7w+2w+4/7 | | 4x^2-4ax+a^2-b^2=0 | | -8-4/5m+2/3m=-119/15 | | -4/5k-2/5+1/6k=121/30 | | 3+3/5w-5w=-19/45 | | -1/4n+9+6n=195/14 | | 2x+9-5x=34/3 | | 2291/495=6k+2/5k+5/9 | | 54=3x+6x+9 | | -18/5=-k+3k-4 | | 48/7=4n+3n-1/7 | | 104/49=6/7k-k+2 | | 3/8+1/5x-2x=-39/280 | | -6b+7+2b=7/2 | | 3+1/2d+d=18/5 | | 3k+2/9+1/6k=-55/9 | | -1+3k-3/4k=7/2 | | -5n+4+2/7n=-368/7 | | t+3+1/2t=4 | | 393/8=6w-1/2w-3/8 | | -2/7x+4+7x=101/84 | | 21/10=7m-5m+1/2 |