You are basically dividing the number by each other so x= 2/5

[latex]x in (-oo:+oo) (2/3)*x = 4/15 // - 4/15 (2/3)*x-(4/15) = 0 (2/3)*x-4/15 = 0 2/3*x-4/15 = 0 // + 4/15 2/3*x = 4/15 // : 2/3 x = 4/15/2/3 x = 2/5 x = 2/5[/latex]