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^2-49 = 0
x^2-49 = 0
x^2-49 = 0
1*x^2 = 49 // : 1
x^2 = 49
x^2 = 49 // ^ 1/2
abs(x) = 7
x = 7 or x = -7
x in (-oo:-7) U (-7:7) U (7:+oo)
(2*x)/(x^2-49) = 0
2*x = 0 // : 2
x = 0
x = 0
| Y=x^3+4x^2-12x-18 | | (2*x)/x^2-49 | | 15-5q=15 | | B*7/6=420 | | 3(y-4)=7y+28 | | X-7-3x+18y+23= | | 6x-88=12x+80 | | (-1)4*5-(8+3)= | | 4x+35=8x-41 | | Wsquared+7w+10=0 | | -15/-3*2 | | y+6=3+4x | | X+(8+X)=44 | | 4x+192=2x+156 | | 2.5(X-4.2)/5-4.3=5.4 | | 2.5(X-4.2)/5-4.3 | | 4-7m=m*4 | | 7+(x-4*x-4)=11 | | 11e=9e+15 | | -95.81=-6.7(r+67) | | X³=64/343 | | -4(1+8n)=-260 | | 8(1-7k)=-216 | | 180-x=0.8x | | 2/3x-3=-7 | | X2=9/856 | | 24-(9x-2)=6(6x+3) | | 2(x-3)=3(2x-5)+4(-x+1) | | x=0.5(x) | | 169-(10x-5)=9(4x+4) | | 4(x+1)-9=2x+2(-2+x) | | -9+4r=-4r-3-6 |