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)
(4/5)*a-(5*a)-10 = -57/5 // + -57/5
(4/5)*a-(5*a)-(-57/5)-10 = 0
(4/5)*a-5*a+57/5-10 = 0
7/5-21/5*a = 0 // - 7/5
-21/5*a = -7/5 // : -21/5
a = -7/5/(-21/5)
a = 1/3
a = 1/3
| -10+3m=-7 | | -10+1/7b+3b=-4/7 | | 6(8/9)=12-12(8/9)+4 | | 9x+9y=209 | | -10+5/7b+5b=-310/7 | | -10+4m=-14 | | -10+3d=14 | | -10+3/7a-6a=-926/77 | | -10+3/5d-7d=-118/15 | | -10+2a-5/7a=-253/28 | | -10+1/4t=-39/4 | | -10-4m+m=-25 | | -10-2b-7b=-1 | | -10+w=-2 | | -10+n=1/3n-52/3 | | -10+n=-37/4 | | -10+m=-77/8 | | -10+m=-117/11 | | -10+7t+4t=1 | | -10+5/6b=-65/6 | | -10+4n-7n=-11 | | -10+3n=-13 | | -10+3d=2d-5 | | -10+2/3n=-10/3 | | -10+1/3k-4k=-10 | | -2+b=-7/6 | | -2+7t=2t-16/3 | | -2+7k+6k=-28 | | 4+3x=-6 | | -2+7d+6/7d=96/7 | | -2+6w=16 | | -2+6/7n+1/3n=-33/14 |