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3 years ago

Find the value of x. A. 5.58 B. 9.14 C. 15.2 D. 10 PLEASE HELP!!! :(

Mathematics

1 answer:

nadezda [96]3 years ago

7 0

Answer:

D. 10

Step-by-step explanation:

${ \sf{(12x + 12) \degree = 79\degree + (5x + 3)\degree}} \\ { \sf{ \{outer \: angle \: is \: equal \: to \: sum \: of \: inner \: angles \}}} \\ { \sf{12x - 5x = 79 + 3 - 12}} \\ { \sf{7x = 70}} \\ { \sf{x = 10}}$

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