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^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
x+x/(x^2)-12 = 2/x-(5/x)-4-3 // - 2/x-(5/x)-4-3
x+x/(x^2)-(2/x)+5/x-12+3+4 = 0
x+x/(x^2)-2*x^-1+5/x-12+3+4 = 0
1*x^1+4*x^-1-5*x^0 = 0
(1*x^2-5*x^1+4*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-5*x^1+4*x^0) = 0
x^1
x^2-5*x+4 = 0
x^2-5*x+4 = 0
DELTA = (-5)^2-(1*4*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)+5)/(1*2) or x = (5-9^(1/2))/(1*2)
x = 4 or x = 1
x in { 1, 4}
x in { 1, 4 }
| -2(4x+3)+2=-4 | | x/x^2+x-12=(2/x-3)-(5/x+4) | | -ln(x+2)=3 | | 4(3x-4)=-16 | | 15+0.05x=57 | | z^2=85 | | 11 = y/3+ 8 | | 6p^2=31p-5 | | 15+50m=25+25m | | ax+box=c | | -4=2x+10 | | 43-(x+9)=8x-2 | | 6(5x+7)+4x-10=7 | | 10c+100-5c=-225 | | 4-0.4(3d)=12 | | x+4a=17+ax-6a | | 17/y+y/y+32/y+y/y=100 | | 2/5p=-4/7 | | -2(-3x-2)=-14 | | 2r^2-16r-40=0 | | 4/5x+4=8 | | 8-y^3=0 | | h/-3+ 9= 12 | | X+20=-5y | | 6(5x+7)4x-10=7 | | 3(2t-0.71)=0.9(1.4-t) | | 2-3/8x=7 | | x+33=98 | | 0.12y+0.06(y+2000)=1020 | | 6x+5=-9x+6 | | -3y-15= | | 26=8-m |