If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
50*(x/90)*(90-X) = 10*X // - 10*X
50*(x/90)*(90-X)-(10*X) = 0
50*(x/90)*(90-X)-10*X = 0
5/9*x*(90-X)-10*X = 0
5/9*x*(90-X)-10*X = 0
50*x-5/9*X*x-10*X = 0
50*x-5/9*X*x-10*X = 0
5*(10*x-1/9*X*x-2*X) = 0
10*x-2*X = 0 // + -2*X
10*x = -(-2*X) // : 10
x = (-(-2*X))/10
x = X/5
5*(x-1/5*X) = 0
5*(x-1/5*X) = 0
( 5 )
5 = 0
x belongs to the empty set
( x-1/5*X )
x-1/5*X = 0 // + -1/5*X
x = -(-1/5*X)
x = 1/5*X
x = 1/5*X
| X=9+0.625 | | X/90*(90-X)*50 | | 9+0.625=x | | x^3+4x=170 | | 5x-(x-8)=2X+6 | | 95*2= | | 13x-(2X+3)=19 | | (k-1)x+(k-2)y-k=0 | | 15p/2=15 | | 0.01x^2+0.25x-0.6=0 | | 11-2x=3-4x | | 6+9+5= | | 8x^3-7x^2+1=0 | | x^3-6x^2+4x+1=0 | | 3.4x-4=11.2x | | 2X^2-16X+8y+64=0 | | 0.3(2)+X=0.5(2+X) | | 503=0.30(x) | | 0.2(7)+x=0.3(7+x) | | 2x-18=40 | | x^2-12x+y+36=0 | | 653=0.30(x) | | 626=0.30(x) | | 584=0.30(x) | | 5x-9x-6x=780 | | 545=0.30(x) | | 450=0.30(x) | | 3450=0.30(x) | | 398=0.30(x) | | 367=0.30(x) | | 10x-3y=21 | | 6a^22b^7-24a^22b^6= |