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3x = 3
x = 1 [c]
banyaknya himpunan bagian a = 3
6x - 12 = 3x - 9
6x - 3x -12 + 12 = 3x - 3x -9 + 12
3x = 3
3x : 3 = 3 : 3
x = 1, maka C
nomor 2
A = {0,1,2}
n(A) = 3
maka banyak himpunan bagian
2^n(A)
2^3
=8