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^3+(15/2)*x^2+(31/2)*x+9 = 0
x^3+(15/2)*x^2+(31/2)*x+9 = 0
x^3+(15/2)*x^2+(31/2)*x+9 = 0 // * 0
{ 1, -1, 2, -2, 3, -3, 6, -6, 9, -9, 18, -18 }
1
x = 1
2*x^3+15*x^2+31*x+18 = 66
1
-1
x = -1
2*x^3+15*x^2+31*x+18 = 0
-1
x+1
2*x^2+13*x+18
2*x^3+15*x^2+31*x+18
x+1
-2*x^3-2*x^2
13*x^2+31*x+18
-13*x^2-13*x
18*x+18
-18*x-18
0
2*x^2+13*x+18 = 0
DELTA = 13^2-(2*4*18)
DELTA = 25
DELTA > 0
x = (25^(1/2)-13)/(2*2) or x = (-25^(1/2)-13)/(2*2)
x = -2 or x = -9/2
x in { -9/2, -2, -1}
x in { -9/2, -2, -1 }
| .10x+.5y+.25z=51 | | (2x+15)+(5x+4)=180 | | 9x=31 | | -0.2u-4.6=3.7u-0.7 | | 1/5(10x-15)=3-2x | | 5+2x=5/2 | | 6=-n-5n | | -7x(2x-1)=4(2x+1)+6(3x-1) | | -12-i= | | -13(x+1)+6(3x-4)=4(x-3)+8 | | -16+10x-9x=8 | | 3(1+7r)=26-2r | | 990/p=45 | | 6(5n-3)=4(5n+3) | | n-3n=-7-3n | | -5t+7=11t-25 | | 1/3x+13=5/7x-1 | | -11-(8)= | | .10x+.5y=46 | | 74.96+5.8= | | n-(-7)=-4 | | 21.35=3a-2.44 | | 3v-6=6v+18 | | 2x^3-3x^2-6x+9= | | 4x-6y-7x+4y= | | -11-(8)+14= | | 9/5c+32=-4 | | x+4(3x-2)=5-3x-2 | | 14/7/8 | | 20y^2+7y+10=0 | | 5x-4x-6=9 | | -11-8+14= |