Решить уравнение!!!очень нужно

[latex]15:2 \frac{1}{2} =x:8 \frac{1}{3}\\\\ 15: \frac{5}{2} =x: \frac{25}{3} \\\\ 15\cdot \frac{2}{5}=x\cdot \frac{3}{25}\\\\ 6= \frac{3x}{25}\\\\ 3x=150\\\\ x=150:3\\\\ x=50 [/latex] [latex] \frac{x^2-27}{x-3}=27\\\\ x^2-27=27(x-3)\\\\ x^2-27=27x-81\\\\ x^2-27x+54=0\\\\ D=729-216=513; \sqrt D=3\sqrt{57}\\\\ x_{1/2}= \frac{27\pm3\sqrt{57}}{2} \\\\ x_1= \frac{27+3\sqrt{57}}{2}\\\\ x_2= \frac{27-3\sqrt{57}}{2} [/latex]