Answer :

12.6 • (–4) ÷ 12 • (–3) ÷ 0.5
= -50.4 
÷ 12 • (–3) ÷ 0.5
= -4.2• (–3) ÷ 0.5
= 12.6 ÷ 0.5
= 25.2

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