Sederhanakanlah 12x ÷ 3 –18y ÷ (–6) 15a ÷ 5 –20b ÷ 10 4x ÷ (–1/2) 3y ÷ (3/2) (10x + 20) ÷ 5 (–12a + 6b) ÷ (–3) (21m – 14) ÷ 7 (–9x – 6y) ÷ (...
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