If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
2400/p = 300-(6*p) // - 300-(6*p)
6*p+2400/p-300 = 0
6*p^1+2400*p^-1-300*p^0 = 0
(6*p^2-300*p^1+2400*p^0)/(p^1) = 0 // * p^2
p^1*(6*p^2-300*p^1+2400*p^0) = 0
p^1
6*p^2-300*p+2400 = 0
6*p^2-300*p+2400 = 0
DELTA = (-300)^2-(4*6*2400)
DELTA = 32400
DELTA > 0
p = (32400^(1/2)+300)/(2*6) or p = (300-32400^(1/2))/(2*6)
p = 40 or p = 10
p in { 10, 40}
p in { 10, 40 }
| f(-2)=3x^2-4x+2 | | k+8/2=4 | | 5n=3n+2 | | $1,350/$75m | | -50=2(a-5) | | -4+p/25=-1 | | 1,350/75m | | 3x+146=7x+94 | | 3(-2)-7=-3(-2)+-19 | | -4+x/8=-2 | | H=-3.6t^2+180t | | 3y=-2x+20 | | 8/52=x/39 | | 5ysquared+24y=0 | | y-7=-3/4(x-3) | | 4=(2/3)x | | 3X+7+20=180 | | 5x+6y=58 | | -60=-5w | | 2n-1=n+3 | | (3/4)x=6 | | 28=2(k+5) | | -2v-1=13 | | n-6=8(4n+7) | | -(1/2)x=10 | | (1/2)x=-6 | | 2400/x=300-6x | | 4x+34=-4x-6(x+6) | | 1=-(1/3)x | | -7(1+9d)=-34 | | S(squared)-7s+14=2 | | 5.5(5-7x)=8-(4x+6) |