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15 x 35 = ( 15 x 30 ) + ( 15 x 5)
525 = 450 + 75
525 = 525
yang dikiri harus sama nilainya dgn yg dikanan
[15×30]+[15×n]=525
n=[525-[15×30]]÷15
=[525-450]÷15
=75÷15
=3
d.3