To solve for the exterior angle \( x \), we need to understand the geometrical context of the angles given.
Assuming these angles are associated with a polygon or a geometric figure where we have an exterior angle property, we know that the exterior angle can be calculated using the relationship:
\[ \text{Exterior angle} = 180^\circ - \text{Interior angle} \]
From the information provided, if we assume that 37°, 42°, and the unknown angle \( x \) represent interior angles of a polygon, we can use the fact that the sum of the internal angles for an n-sided polygon is given by the formula \( (n-2) \times 180^\circ \). However, the exact type of polygon or configuration isn't fully specified in your prompt.
To find \( x \), if we consider these angles as the angles around a point, we can also add them together since they would sum up to \( 360^\circ \):
\[ 37^\circ + 42^\circ + x = 360^\circ \]
Solving for \( x \):
\[ x = 360^\circ - (37^\circ + 42^\circ) \] \[ x = 360^\circ - 79^\circ \] \[ x = 281^\circ \]
So the measure of the exterior angle \( x \) is \( 281^\circ \). If you meant something different or if there are other constraints, please provide more details.
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