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= 4 + 2x + 10
= 2x + 14
2x + 14 = 30
2x = 30 - 14
2x = 16 cm
Jadi panjang LM = 16 cm
30 = 4 + 2x + 10
30 = 14 + 2x
30-14 = 2x
16 =2x
16:2 = x
8 = x
panjang LM = 2x = 2 x 8 = 16 cm