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)
4*(X+3)+260/X = 0
(4*X*(X+3))/X+260/X = 0
4*X*(X+3)+260 = 0
4*X^2+12*X+260 = 0
4*X^2+12*X+260 = 0
4*(X^2+3*X+65) = 0
X^2+3*X+65 = 0
DELTA = 3^2-(1*4*65)
DELTA = -251
DELTA < 0
4 = 0
4/X = 0
4/X = 0 // * X
4 = 0
X belongs to the empty set
| 9x-2(x-6)=7x+2 | | 10+.99d=.89d | | (9/(x-2))(7/(x-5))=0 | | 10+.99d=.88d | | 2y-5=x-10 | | ((x+3)/(x-1))/((x^2+x)/(x-1)) | | 653+456= | | 653+456=1209 | | 0.8x+6.37=0.4x+9.57 | | 4(w+3)=3-15 | | 2(3.5n+6)=2.5n+(-2) | | 3xa=2b | | 0.30(12)+0.5x=0.15(18+x) | | E^2x-2=14 | | 3ax=3b | | (10y^2+27Y-15)/(2Y+7) | | 8c=9c+3 | | 5X+39+9X-125=180 | | 38(7-2.5x)=14(2x-10)+61.6 | | 7x-3=x/6+5 | | 6X+27+7X-9=96 | | 2(8y-4.4)+7=6(7y-0.3) | | (y+7)/(y^2-8y+7)=(1/(y-1))-(1/(y-7)) | | (x^2-16)/(x^2-3x-4)=0 | | (0.25+0.083+0.3)x0.3/0.5 | | 11(x-2)-4=9x+4 | | -75x^2+290x=240 | | 4X+20+6X+0=90 | | 5(y+2.6)=12y-19.2 | | 4X+20+6X+O=90 | | 3X+144+2X+1=180 | | 3/(7x+4)=7/(x-2) |