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5:6 -> dikalikan 7
menjadi : 35 : 42
b.
7:n -> dikalikan 7
menjadi 49 : n*7
n*7 = 63;
n = 9 ---> 7:9
c.
n:15 -> dikalikan 9
menjadi 9n : 135
9n = 108;
n = 12 ---> 12:15