What is the value of x? triangle rst

We can see that

angle(C)=angle(B)

Since, both angles are equal

so, this is isosceles triangle

and in isosceles triangle , two sides are equal

so, we get

now, we are given

now, we can set them equal

we can solve for x

Add both sides 8

Subtract both sides by x

So, we get

..............Answer