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-x + y = 5
y = 4x - 7
-4x + y = -7
-x + y = 5
-4x + y = -7 -
3x = 12
x = 4
-x + y = 5
-4 + y = 5
y = 5 + 4
y = 9
HP = { 4 , 9 }
di substitusikan, = y=4.4 - 7, y=16-7, =9
HP=kurungkurawal(4,9)kurungkurawal