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42/12 - p + 3/5 = 1 4/15
-p = 1 4/15 - 42/12 - 3/5
-p = 1 4/15 - 7/2 - 3/5
-p = 1 4/15 - 3 1/2 - 3/5
-p = 1 8/30 - 3 15/30 - 18/30
-p = -2 7/30 - 18/30
-p = -2 25/30
-p = -2 5/6
p = 2 5/6
jawaban: p = 2 5/6