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)
13/x+1/(x^2)+42 = 0
13*x^-1+x^-2+42 = 0
t_1 = x^-1
1*t_1^2+13*t_1^1+42 = 0
t_1^2+13*t_1+42 = 0
DELTA = 13^2-(1*4*42)
DELTA = 1
DELTA > 0
t_1 = (1^(1/2)-13)/(1*2) or t_1 = (-1^(1/2)-13)/(1*2)
t_1 = -6 or t_1 = -7
t_1 = -7
x^-1+7 = 0
1*x^-1 = -7 // : 1
x^-1 = -7
-1 < 0
1/(x^1) = -7 // * x^1
1 = -7*x^1 // : -7
-1/7 = x^1
x = -1/7
t_1 = -6
x^-1+6 = 0
1*x^-1 = -6 // : 1
x^-1 = -6
-1 < 0
1/(x^1) = -6 // * x^1
1 = -6*x^1 // : -6
-1/6 = x^1
x = -1/6
x in { -1/7, -1/6 }
| cos(x)=1+sin(x) | | (1/3)x+70=(3/4)x+30 | | 6x-3000=1200 | | x^3=61.5 | | x+5+4/x=0 | | 1(3m+70)=3(4m+10) | | -6(4x-3)+8x-(12x-4)=-62 | | -3/2x6 | | 4(6x+9)= | | 9x-6=24 | | (r-2)(r+6)=109 | | y=100(200)+1000 | | y=100(100)+1000 | | 1/2+3/7 | | -(x+4)/3=-8 | | 5v^2+4=-21v | | x^5-y^5=0 | | 3/12(2x-12)=8/12(3x+9) | | a(a+7)=90 | | 8x^(17/19)-16=0 | | y=1/8(2) | | 3x+33-6=(5x+2)(5x+2) | | 4x^2-98x+258=0 | | x^3+20x^2+100x=0 | | 20x^2+100x=0 | | F(x)=x-9 | | x=(-4*y)/15 | | -13-1/4=7 | | F(x)=4-8x | | 1=3x-12 | | 6x(x-1)=20-13x | | 2(2)+4y=8 |