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3y = 9 - 12
3y = -3
y = -1
y > -1
hp {0,1,2,3......}
b) 3x - 2 < x + 8
3x - 2 = x + 8
3x - x = 8 + 2
2x = 10
x = 5
x < 5
x anggota A maka, A= {.....1,2,3,4}
c) 2(x - 3) < -3(x +1) + 7
2x - 6 < -3x -3 + 7
2x - 6 = -3x -3 + 7
2x +3x = -3 + 7 +6
5x = 10
x = 2
x < 2
x anggota B maka B= {.....-1,0,1}