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)
30/x = (18/2)*x+7 // - (18/2)*x+7
30/x-((18/2)*x)-7 = 0
30/x-9*x-7 = 0
30*x^-1-9*x^1-7*x^0 = 0
(30*x^0-9*x^2-7*x^1)/(x^1) = 0 // * x^2
x^1*(30*x^0-9*x^2-7*x^1) = 0
x^1
30-9*x^2-7*x = 0
30-9*x^2-7*x = 0
DELTA = (-7)^2-(-9*4*30)
DELTA = 1129
DELTA > 0
x = (1129^(1/2)+7)/(-9*2) or x = (7-1129^(1/2))/(-9*2)
x = (1129^(1/2)+7)/(-18) or x = (7-1129^(1/2))/(-18)
x in { (1129^(1/2)+7)/(-18), (7-1129^(1/2))/(-18)}
x in { (1129^(1/2)+7)/(-18), (7-1129^(1/2))/(-18) }
| 4/5(j+5) | | 1/5(5x-3)=7 | | 27-1/20(3x)=18-1/20(2x) | | 1/4(n-6)=1/4n-3/4 | | 5ytf*e+3456x=x | | -18x^2+6400x-275000=0 | | 1/2x=2+3/4 | | C-12=3(C-6)-144 | | 2(2x+4)=3(x-2)+5 | | 5x-13=2(x-3)+2(3x-11) | | 128366277y+352x+x=y | | -2(t+2)*5t=6t+11 | | -3.5t-6.4=1.2t+3 | | 1/2(6n)=4n-12 | | 6-8x=7-3x | | x/5+3/10=8 | | x-4/2=x+3/7 | | R-7.7=-7.2 | | x+12=x/10+3/10 | | 14+3a=-24-1 | | 36-3n=6(4n+1) | | 6a=0.9 | | -21.6-y=33 | | 2a+a=72 | | 14x+19=6x-73 | | -44s-2=-5.5s-4.2 | | -2x-5=14x+1 | | -4=t-5 | | 2(w-3)=4(w+2) | | 28+12=x/10+3/10 | | 48x5/12 | | -(1+7x)-6(-7-x)=3 |