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28 = 4 (2x-3)
28= 8x-12
28+12 = 8x
40 =8x
5 = x
maaf kalo salah
28=4 (2x-3)
28=8x-12
28+12=8x
40=8x
40/8=x
5=x
jadi sisi persegi 5 cm