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Answer:
since the triangles are congruent, and you're given the measures of which are "corresponding part of the congruent triangles" so they must be equal
hence,
ΔIJK ≈ ΔPQR => ∡I = ∡P =>
=> 3X + 4 = 72 - X
3X + X = 72 - 4
4X = 68
X = 68 : 4
X = 17
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