simplify and factorise : (a+2b+3c)^2-(a-2b-3c)^2-6b^2-9bc
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ʜᴏᴩᴇ ɪᴛ ʜᴇʟᴩꜱ yᴏᴜ :)
ᴩʟᴇᴀꜱᴇ ᴍᴀʀᴋ ᴍᴇᴀꜱ ʙʀᴀɪɴʟɪᴇꜱᴛ :-:
ᴩʟᴇᴀꜱᴇ ᴍᴀʀᴋ ᴍᴇᴀꜱ ʙʀᴀɪɴʟɪᴇꜱᴛ :-:
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