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)
x*((12*x^2+9*x-7)/3) = 0
(x*(12*x^2+9*x-7))/3 = 0
12*x^2+9*x-7 = 0
12*x^2+9*x-7 = 0
DELTA = 9^2-(-7*4*12)
DELTA = 417
DELTA > 0
x = (417^(1/2)-9)/(2*12) or x = (-417^(1/2)-9)/(2*12)
x = (417^(1/2)-9)/24 or x = (-(417^(1/2)+9))/24
(x+(417^(1/2)+9)/24)*(x-((417^(1/2)-9)/24)) = 0
(x*(x+(417^(1/2)+9)/24)*(x-((417^(1/2)-9)/24)))/3 = 0
( x+(417^(1/2)+9)/24 )
x+(417^(1/2)+9)/24 = 0 // - (417^(1/2)+9)/24
x = -((417^(1/2)+9)/24)
( x-((417^(1/2)-9)/24) )
x-((417^(1/2)-9)/24) = 0 // + (417^(1/2)-9)/24
x = (417^(1/2)-9)/24
( x )
x = 0
x in { -((417^(1/2)+9)/24), (417^(1/2)-9)/24, 0 }
| Y=63x^2-9 | | x=7x^2(14x) | | y=125x^2+5x | | 15/y+10/y=5 | | Y=36x^2+18 | | (x-5)(2x+7)= | | Y=3x^2-9x | | 5y=2x-30 | | y=4x(6x-14) | | 9x-(5x+9)=2x-21 | | Y=-6x(-2x+2) | | 2489732+5+6*45-53/46+3 | | 4(3x-4)+5(6+x)=48 | | Y=-2.5x(2x+6) | | 3b=0.5 | | y=-3x(-3x-30) | | y=2x(4x-9) | | Y=2x(8x+12) | | (3x^2-30x+75)/(3x-15) | | (3c-3d)-(c-3d)= | | -3-(x+3)=-4+3(3x-2) | | 9=8b-5/3 | | P=x(300-12x)-1450 | | -4.6y+1.6=0.6 | | 3=4x-3/7 | | a^2-4-29=0 | | 11x-76=x | | -1x-5=-6 | | x^2-3/2x+9/16=0 | | -t^2+3t+18=0 | | 2/3-5/18 | | 3w^2+w=30 |