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 < -20 // + 20
a/4+20 < 0
1/4*a+20 < 0 // - 20
1/4*a < -20 // : 1/4
a < -20/1/4
a < -80
a in (-oo:-80)
(-oo:-80)
| -7m=-8m-6 | | 3(2x-5)+19=25 | | -5-1=79 | | 9p+3p^2-30=0 | | -2=k/7+2 | | -117=9b | | 3+6h=5h | | z=-6x+4y | | x+7=x^2+6x+13 | | 7f-7=3+6f | | 12x-6=15x-15 | | -6s-2=-7s | | x+84=75 | | 3q*r+9t=7u | | q^2+8q+7= | | g/a-7=15 | | 10n=-5+9n | | 16x+4x-8=40+8x | | 0=u^2-4u-5 | | 3b-2=17 | | 4x+7-8x=13-11x | | -20=-13-m | | -3t=-t+10 | | (2x^2)/(3y^5) | | (1/2)5= | | -3x-0.4=x+1.4 | | X^2=198 | | 18x^9-32x^7+18x^6-32x^4=0 | | x-4-2x=16 | | 13+2(5c-2)=9 | | 96x+36y=1350 | | 5w=10+10w |