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1/3x = 1/4
x = 1/4 ( 3 )
x = 3/4
x ini nantinya dimasukkan ke persamaan x + y = 28
x + y = 28
3/4 + y = 28
y = 28 - 3/4
y = 112/4 - 3/4
y = 109/4
HP = { ( 3/4, 109/4 ) }