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3x - 3 = 120 : 8
3x - 3 = 15
3x = 15 + 3
3x = 18
x = 18 : 3
x = 6 cm
a. x = 6 cm
(3x-3) = (3.6-3) = 18 - 3 = 15
panjang adalah 15 cm
c. 2(p+l)
2(15 + 8)
=2(23)
=46
keliling persegi panjang adalah 46 cm