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3 (5+y) = 25
15 + 3y = 25
3y = 25 - 15
3y = 10
y = 3,33cm
3/5 = 4/4+x
3 (4+x) = 20
12 + 3x = 20
3x = 20 - 12
3x = 8
x = 2,67cm
jadi x + y = 3,33 + 2,67 = 6cm