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= 21/4 + 15/4 x 7/15
= 21/4 + 7/4
= 28/4
= 7
21/4 + 15/4 : 15/7 =
21/4 + 15/4 x 7/15 =
21/4 + 105/60 =
315/60 + 105/60 =
420/60 = 7