We know that both triangles are congruent because of the HL Theorem (in which both the hypotenuse and a leg are confirmed as congruent in a right triangle). Because of this, we know 4x = 6x - 58
Subtract 6x from both sides:
-2x = -58
Multiply both sides by -1:
2x = 58
Divide both sides by 2:
x = 29
The answer is Option C, x = 29