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p=y/x
7y=3x
y= 3/7x= 3/7 * 50= 150/7cm
x= 5dm= 50cm
1/f = 1/x + 1/y
1/f= 1/50 + 7/150
1/f= 3/150 + 7/150
1/f= 10/150
1/f= 1/15
f= 15 cm