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)
40/550 = 35/x // - 35/x
40/550-(35/x) = 0
40/550-35*x^-1 = 0
-35*x^-1 = -4/55 // : -35
x^-1 = 4/1925
-1 < 0
1/(x^1) = 4/1925 // * x^1
1 = 4/1925*x^1 // : 4/1925
1925/4 = x^1
x = 1925/4
x = 1925/4
| 40(550)=35x | | 40/550=35x | | 15b^2+14b-8=0 | | 4(4x+3)=19x+9-3x+3 | | ***-/**/ | | 7-3[3-(6y-4)]= | | 6x-9=4x-51 | | S=4t^3+2t+12 | | 32=2x+(-4x+48) | | 1/3*log4(x-1) | | x=y^4+2y^2 | | 11y+25=11y | | 8x+5y=56 | | 9a+9(57+9a)=-27 | | (3x^2+xy-y^2)dx+x^2dy=0 | | -9a+b=57 | | 13(x+6)=4(x+222) | | H=2x*2+16x | | -5+y+y=7 | | (3/x^8)^2 | | 2n-mn+3m-6=0 | | 8(30+-3y)-y=65 | | 5/6*4/3 | | 3h+6s+5j=132 | | 6/7X-7/6x=11/12x-17 | | x+7y=40 | | ab+3c-3b-ac= | | x-2/15=2/25 | | X=15/4 | | 3=logx | | 5y^2-6xy+5x^2-4=0 | | (-3/8)*4/7 |