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3x + 12 > 4x + 20, karena dikali
3x - 4x > 20 - 12
-x > 8
x < -8
3x+12 ≥ 4x+20
3x-4x ≥ 20-12
-1x ≥ 8
x ≥ 8/-1
x ≥ -8