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3x = 11 + 4
3x = 15
jika dikalikan 2
6x = 30
==========
6x - 8 = 20
6x = 20 + 8
6x = 28
salah
3x - 1 = 11
3x = 11 + 1
3x = 12
salah
6x - 4 = 22
6x = 22 + 4
6x = 26
salah
3x - 2 = 13
3x = 13 + 2
3x = 15
benar
---> D.