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substitusikan nilai y
3x +2y = 5
3x +2(-2x+1) = 5
3x - 4x + 2 = 5
-x + 2 = 5
-x = 5 -2
-x = 3
x = -3
substitusikan nilai x
y = -2x + 1
y = -2(-3) + 1
y = 6 + 1
y = 7
HP={-3,7}