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5x + 3x + 7x = 120
15x = 120
x = 120/15
x = 8
ac = sisi b
maka
3x = 3(8)
= 24
120 = 5y + 3y + 7y
120 = 15y
y = 120 : 15
y = 8
BC = b = 3y = 3 x 8 = 24 cm