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2 answers:
-- these are called same side exterior angles , which means they are supplementary .
x + 9 + 2x + 6 = 180
3x + 15 = 180
3x = 165
x = 55
so, option B.
x=3
Step-by-step explanation:
(x+9)°=(2x+6)°(by alternate exterior angle)
9-6=2x-x
3=x
check
(x+9)°=(2x+6)°
put value
3+9=2×3+6
12=12
LHS = RHS
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