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Jawaban ;
4(x+2) - 4(2x+4) = 12
4x + 8 - 8x - 16 = 12
4x - 8x + 8 - 16 = 12
-4x - 8 = 12
-4x = 12 + 8
-4x = 20
-x = 5
x = - 5
sibtusikan x = - 5
3x - 2 = 3(-5) - 2
-15-2 = - 17