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)
Y = (-3/5)*x^2-(12*x)-25 // - (-3/5)*x^2-(12*x)-25
Y-((-3/5)*x^2)+12*x+25 = 0
Y+(3/5)*x^2+12*x+25 = 0
Y+3/5*x^2+12*x+25 = 0
DELTA = 12^2-(3/5*4*(Y+25))
DELTA = 144-12/5*(Y+25)
144-12/5*(Y+25) = 0
144-12/5*(Y+25) = 0
84-12/5*Y = 0
84-12/5*Y = 0
84-12/5*Y = 0 // - 84
-12/5*Y = -84 // : -12/5
Y = -84/(-12/5)
Y = 35
DELTA = 0 <=> t_1 = 35
x = -12/(3/5*2) i Y = 35
x = -10 i Y = 35
( x = ((144-12/5*(Y+25))^(1/2)-12)/(3/5*2) or x = (-(144-12/5*(Y+25))^(1/2)-12)/(3/5*2) ) i Y > 35
( x = 5/6*((144-12/5*(Y+25))^(1/2)-12) or x = -5/6*((144-12/5*(Y+25))^(1/2)+12) ) i Y > 35
Y-35 > 0
Y-35 > 0 // + 35
Y > 35
x in { -10, 5/6*((144-12/5*(Y+25))^(1/2)-12), -5/6*((144-12/5*(Y+25))^(1/2)+12) }
| 4y+6y=76-26 | | 5+2s=9 | | -3(1x+6)=18 | | 3/n=15/6 | | x+x=47 | | x+n=47 | | 1/x=4/x-1 | | -10*(5x+12)-(-40*(-6))=0 | | 5-2u=1 | | -520=-8(8x-15) | | 2(3x+1)=24 | | 9y-8x=27 | | 5/8=15/n | | -4(-5x+4)=-16 | | 2x^2+4xy-2y^2-1=0 | | -10*(5x+4)-(-40*(-6))=0 | | 10=2m | | -7/3x-3=52 | | 5X-15/2=10 | | 18y^4+21y^3-30y^2=0 | | 96=b^2+10b | | 2x+5=5-x | | 1x=4x-1 | | 6(9-6x)=54 | | 25x^2+16y^2=400 | | (2X-10)=X | | 4y-7=2y+1 | | -6/n=-27 | | 3x-9x+x-3= | | 4x+6=3x+1 | | -60+10x=180 | | -40*((-2x-6)+3)-30*32=0 |