Answer:
x=14
Step-by-step explanation:
8x-9+6x-7 = 180 (being adjacent angles)
14x-16 = 180
14x = 180+16
14x =196
x = 196/14
x =14
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x = 14
Both angles are supplementary which means that they both add up to 180°.
8x-9+6x-7 = 180
14x-16=180
14x=196
