In Isosceles Triangle RST $\overline { R S } \cong \overline { S T }$

Multiple Choice

In isosceles triangle RST , $\overline { R S } \cong \overline { S T }$ . If $R S = 2 x + 3$ , $R T = x$ , and the perimeter of $\triangle R S T$ is 36, find the value of x .

A) $x = 5.5$
B) $x = 6$
C) $x = 6.5$
D) None of These