5p-[4p-2p-5q-3{2p-(3p-3q)}]
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Solution:
5p-[4p-2p-5q-3{2p-(3p-3q)}]
⟹ 5p-[4p-2p-5q-3{2p-3p-3q}]
⟹ 5p-[4p-2p-5q-3{-p-3q}]
⟹ 5p-[4p-2p-5q+3p+9q]
⟹ 5p-[2p-5q+12q]
⟹ 5p-[2p+7q]
⟹ 5p-2p+7q
⟹ 3p+7q
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