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Explanation & Answer
(8x+3) + (5x+15) + (7x+2) = 180 Reason: Triangle Sum Theorem
20x + 20 = 180 Combining Like terms
-20 -20
20x = 160 Subtraction
x = 8
<C = 5x+15
5(8)+15 Substitution
40+15
55
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