Please solve this problem. I can't reach to the right answer.
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I don't know friend sorry
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15. 7+2[-8-{-3-(-2-3)}-4]
=7+2 [-8-{-3-(-5)}-4]
=7+2 [-8-{-3+5}-4
=7+2 [-8-{2}-4]
=7+2 [-8-2-4]
=7+2 [-14]
=7+2×-14
=7+(-28)
=7-28
=-21
16.-5-[-8-{-4-(-2-3)}+13]
=-5-[-8-{-4-(-5)}+13]
=-5-[-8-{-4+5}+13]
=-5-[-8-{1}+13]
=-5-[-8-1+13]
=-5-[+4]
=-5-4
=-9
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