(7abc+b2)(7-bc)+c (2b3-9ab)
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(7ᴀʙᴄ+ʙ²)(7-ʙᴄ)+ᴄ(2ʙ³-9ᴀʙ)
=»49ᴀʙᴄ+7ʙ²-7ᴀʙ²ᴄ²-ʙ³ᴄ+2ʙ³ᴄ-9ᴀʙᴄ
=»40ᴀʙᴄ+7ʙ²-7ᴀʙ²ᴄ²+ʙ³ᴄ
40ᴀʙᴄ+7ʙ²-7ᴀʙ²ᴄ²+ʙ³ᴄ ɪꜱ ᴛʜᴇ ʀᴇqᴜɪʀᴇᴅ ᴇxᴩᴀɴꜱɪᴏɴ .....
=»49ᴀʙᴄ+7ʙ²-7ᴀʙ²ᴄ²-ʙ³ᴄ+2ʙ³ᴄ-9ᴀʙᴄ
=»40ᴀʙᴄ+7ʙ²-7ᴀʙ²ᴄ²+ʙ³ᴄ
40ᴀʙᴄ+7ʙ²-7ᴀʙ²ᴄ²+ʙ³ᴄ ɪꜱ ᴛʜᴇ ʀᴇqᴜɪʀᴇᴅ ᴇxᴩᴀɴꜱɪᴏɴ .....
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