The value of x in the triangle is 9
Using the concept of similar sides of a triangle ;
Using the expression, we can solve for the value of x
2x + 12 = 5x - 15
collect like terms
2x - 5x = -15 - 12
-3x = -27
divide both sides by -3 to isolate x
x = 9
Hence, the value of x is 9