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x = 1,5y
⇒ x - 1,5y = 0 ... ( 2 )
( 1 ) - ( 2 )
2,5y = 180
y = 180 : 2,5
y = 72
Masukkan y ke ( 2 )
x - 1,5( 72 ) = 0
x - 108 = 0
x = 108
Maka, HP { 108,72 }