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)
12-((3/5)*x) > 39 // - 39
12-((3/5)*x)-39 > 0
(-3/5)*x-39+12 > 0
-3/5*x-27 > 0 // + 27
-3/5*x > 27 // : -3/5
x < 27/(-3/5)
x < -45
x in (-oo:-45)
(-oo:-45)
| 8(3x-4)=(6x-8) | | 16-x^8=0 | | 1x-.1x=45 | | 18x-7=16x+3 | | (10-x)/-2=7 | | 3d-2=56 | | Y-10=-10/8(x-6) | | 5x+4=-x-22 | | 2-50x^4=0 | | 8x^4-2=0 | | 3(x-0.8)=4x | | d^3+12d^2+35d=0 | | -4x^3-52x^2-48x=0 | | 6*125.75=y | | 3-9=30 | | 7x+21+4=25+7x | | 4x=503 | | f/5-13=4 | | 200=10x^2+5 | | 10x+10=9x+7 | | 5n-4=10-3y | | 45x^7-5x=0 | | (x+1)(x+4)=84 | | 1.2+.2*x=.8 | | 7.5m=-45 | | Y=3x-2000 | | (x+1)(x+4)(1)=84 | | 4x+-24=4+82 | | (x^2-x-2)*(x^2+x-2)=0 | | X^2+3x-27=1 | | X-42=43 | | 8x+6+6x-6=10 |