Solve for x. i need the answer

The principle you must know and apply here is that the sum of the interior angles of a triangle is always 180 degrees.  Furthermore, a right angle is always 90 degrees.  Thus, the sum of the other 2 angles must be 90 degrees.

So, 2x-11 = x + 17.  Gather the x terms on the left side and the constant terms on the right side, to find x.  Show your work.