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)
a*((-4*a-1)/10) = 3/8 // - 3/8
a*((-4*a-1)/10)-(3/8) = 0
a*((-4*a-1)/10)-3/8 = 0
(a*(-4*a-1))/10-3/8 = 0
(8*a*(-4*a-1))/(8*10)+(-3*10)/(8*10) = 0
8*a*(-4*a-1)-3*10 = 0
-32*a^2-8*a-30 = 0
-32*a^2-8*a-30 = 0
-2*(16*a^2+4*a+15) = 0
16*a^2+4*a+15 = 0
DELTA = 4^2-(4*15*16)
DELTA = -944
DELTA < 0
-2 = 0
-2/(8*10) = 0
-2/(8*10) = 0 // * 8*10
-2 = 0
-2 = 0
a belongs to the empty set
a belongs to the empty set
| (-7,-8),m=-3/7 | | 5x+8=-3 | | -4v-8v-(-6v)=18 | | 0.8-(6-7.2)= | | 13/14x=39 | | 19y-9=17+19y | | 13.14x=39 | | -x-88=8x+110 | | 2(3)+3Y=18 | | l-x+5l-3=-2 | | 264=2(26x) | | 3(x-2)+1=x-(2x-1) | | 1/(1-x^2)^1/2=0 | | -3+.5n=.5(-n+14) | | 9y+10=17 | | L=ft+H | | (-x/y)5=(x5/y) | | 6+3+2= | | -10=2x/5 | | 1/3×8 | | (-2)=5x-9 | | 1/(1-x^2)^1/2 | | 3+2x=2+7x | | 22+2x=96 | | 4.4z-4=9.2 | | -6=-8X+6(X-3) | | 4+3n=n+2 | | 4y+3=6y-27 | | 6x+3y=240 | | -2.9=7f-43 | | -5(1+5n)+6n=-7(n+11) | | r-6n^2+1=0 |