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20 = 4 (2x - 3)
20 = 8x - 12
8x = 20 + 12
x = 32/8
x = 4
sisi = 2x - 3 = 2. 4 - 3 = 8-3 = 5 cm
Jadi panjang sisinya yaitu 5 cm
20 = 4.(2x-3)
20 = 8x-12
20+12 = 8x
32 = 8x
x = 32/8
x = 4 -----> p.sisi = 2x-3 = 2.4 - 3 = 8-3 = 5 cm