To find an equation for the two adjacent angles given as \( (2x + 3) \) degrees and \( (-6) \) degrees, we can use the fact that adjacent angles are often formed when they are supplementary or form a linear pair, which means that their sum equals \( 180 \) degrees.
We can set up the equation as follows:
\[ (2x + 3) + (-6) = 180 \]
Now, simplify the equation:
\[ 2x + 3 - 6 = 180 \]
This simplifies to:
\[ 2x - 3 = 180 \]
To isolate \( x \), add 3 to both sides:
\[ 2x = 183 \]
Now, divide both sides by 2:
\[ x = 91.5 \]
Therefore, the equation that relates the two adjacent angles is:
\[ (2x + 3) + (-6) = 180 \]
And \( x = 91.5 \) is a solution to the equation. If you have different requirements regarding the nature of the angles (like they being complementary), please let me know!