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Answer:
R = 150°
Step-by-step explanation:
M = x
R = x*5 = 5x
[tex]5x + x = {180}^{o} \\ 6x = {180}^{o} \\ x = \frac{ {180}^{o} }{6} \\ x = {30}^{o} [/tex]
[tex]5x \\ 5(30) = {150}^{o} [/tex]