5 – [23 – {19 – (15 - ?)} ] = 12 x 2 ÷ (1/2)
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Step-by-step explanation:
5-[23-{19+5-x}] = 12×1
5-[23-19-5+x] =12
5+23+19+5-x = 12
52-x = 12
-x = 12-52
x = 40.
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