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(2x+7) + (3x-12) + (2x+7) +(3x-12) = 360
10x -10 = 360
10x = 360 + 10
10x = 370
x = 370/10
x = 37
besar <L = 2x + 7
= 2.37 + 7
= 81 derajat (C)