20-[10-3×{(18-7×4-30)}]
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Step-by-step explanation:
20-[10-3×{(18-7×4-30)}]
= 20-[10-3×{(18-28-30)}]
= 20-[10-3×{(-10-30)}]
= 20-[10-3×-40]
=20-[10- -120]
= 20-[10+120]
= 20 - 130
= -110
hope it helps
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