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6 - 6x > 3x - 12
6 + 12 > 3x + 6x
18 > 9x
9x < 18
x < 2
Hp = ( 1,0,-1,...)
6-6x > 3x-12
-6x-3x > -12-6
-9x > -18
x > 2
maaf kalau salah.