To find the value of \( x \) in the context provided, we need more details about how these angles (51° and (3x)°) are related. If these angles are part of a geometric figure or equation (like in a triangle or a linear pair), please provide that context.
However, if we are assuming that these two angles are supplementary (which means they sum to 180°), we can set up the equation:
\[ 51° + (3x)° = 180° \]
Now, we can solve for \( x \):
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Subtract 51° from both sides: \[ (3x)° = 180° - 51° \] \[ (3x)° = 129° \]
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Divide both sides by 3: \[ x = \frac{129°}{3} \] \[ x = 43° \]
If we assume that these angles are not supplementary or related in another way, please provide additional information corresponding to the problem so I can assist you better.