To find the value of \( x \) given that \( 19^\circ \) and \( (x - 50)^\circ \) are complementary angles, we can use the property that complementary angles sum up to \( 90^\circ \).
We can set up the equation as follows:
\[ 19 + (x - 50) = 90 \]
Now, let's solve for \( x \):
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Combine like terms: \[ 19 + x - 50 = 90 \] \[ x - 31 = 90 \]
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Add \( 31 \) to both sides: \[ x = 90 + 31 \] \[ x = 121 \]
Thus, the solution is: \[ \boxed{121} \]