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)
7-((8*x)/10) > 12 // - 12
7-((8*x)/10)-12 > 0
(-4/5)*x-12+7 > 0
-4/5*x-5 > 0 // + 5
-4/5*x > 5 // : -4/5
x < 5/(-4/5)
x < -25/4
x in (-oo:-25/4)
(-oo:-25/4)
| 5y-3=2y+1 | | 4a+87b+34c=0 | | 30-8b=-2(1+8b) | | 15x+27=19-31x+8 | | (2/5)a=0 | | 3/4x=110 | | 2x+10=x+8+10 | | Logb=xloga | | (x-97)(x-3)=0 | | x^3-30x+3=0 | | 5a+7b=57 | | 5d-7=13 | | 72.1y= | | 4/9-(7/9-2/9) | | 1/5×10.5 | | 1/7×10.5 | | a^3-6b^2+59c=6 | | 21x^2-12x=-1 | | f(x+7)=x^2+8x+45 | | 9+6x=36 | | 6+5x=456 | | 2senx(cos^2x)-senx=0 | | 2cos^2-5cosx+2=0 | | 3senx+cosx-3=o | | x+2y=123 | | 3senx+cosx-3=0 | | 6(4-x)+55=5(2+3x) | | 26x^2-130x-104=0 | | 5-3x+1=-3 | | x/10-3=7 | | 153.48=2.26w+15.68 | | logy=1.9 |