If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6/9)*x+45 = 7/x-(4/9)+5 // - 7/x-(4/9)+5
(6/9)*x-(7/x)+4/9-5+45 = 0
(6/9)*x-7*x^-1+4/9-5+45 = 0
2/3*x^1-7*x^-1+364/9*x^0 = 0
(2/3*x^2+364/9*x^1-7*x^0)/(x^1) = 0 // * x^2
x^1*(2/3*x^2+364/9*x^1-7*x^0) = 0
x^1
(2/3)*x^2+(364/9)*x-7 = 0
(2/3)*x^2+(364/9)*x-7 = 0
DELTA = (364/9)^2-(-7*4*(2/3))
DELTA = 134008/81
DELTA > 0
x = ((134008/81)^(1/2)-(364/9))/(2*(2/3)) or x = (-(364/9)-(134008/81)^(1/2))/(2*(2/3))
x = 3/4*((134008/81)^(1/2)-364/9) or x = -3/4*((134008/81)^(1/2)+364/9)
x in { -3/4*((134008/81)^(1/2)+364/9), 3/4*((134008/81)^(1/2)-364/9)}
x in { -3/4*((134008/81)^(1/2)+364/9), 3/4*((134008/81)^(1/2)-364/9) }
| 5z+14z=57 | | -(6y+2)-(-5y-7)=2 | | -2x^2+3x+13=0 | | 5.25=0.1522y-298.592 | | 2x^2+3x+13=0 | | -276/12=x | | xy-5y=1 | | -6(2y-1)+2y=7+2(4y-2) | | y/12=-23 | | -10.5x=63 | | 200+.25x=425 | | -3(3b+1)+(10b-6)=0 | | 1.7q-1.7-4.2q=-3.5q-5.3 | | 2+3x=59 | | 9x+3-4(-4x-1)=7(x-1) | | 6y^2-21y/3y^2-18y | | 6x=6(x-2) | | 31+32+33+34+...+118= | | 5(y+5)=-2(7y-9)+5y | | (w-1)/(w+1)=(w+6)/(w+7)+1 | | 2x(3x^3-4x^2+x-8)= | | 9+2s-7=9s+20-4s | | z/2=-6 | | 3*12*12*5.9= | | 7(t-3)+5t=4(3t+5)-11 | | 3(w-1)-9=-3(-7w+2)-8w | | 6x-8=-2x+5 | | 3x/x+2=6-6/x+2 | | -60/8 | | 42-[1+9y-3(y+3)]=-3(2y-4)-[8(y-1)-1y+5] | | 3v-3+2(3v+3)=-3(v+4) | | 7(u-9)=-3u-13 |