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n(P) = 3
2³ = 8 himpunan
2).
5x - y = 14 | × 2 |
10x - 2y = 28
3x + 2y = -2
10x - 2y = 28 +
13x = 26
x = 2
3x + 2y = -2
6 + 2y = -2
2y = -8
y = -4
=> 2x + 2y
= 4 - 8
= -4