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3(p+q) + 2p-q - 2p-3q =
3p+3q + 2p-q - 2p-q =
3p+2p-2p + 3q-q-q =
3p+q
3(p+q) + 2p - q - 2p - 3q
3p + 3q + 2p - q - 2p - 3q
3p + 2p - 2p + 3q - 3q - q
3p - q