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Multiply (12a + 17b) xx 4c...

Multiply
`(12a + 17b) xx 4c`

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`12a xx 4c + 17b xx 4c`
= `12 xx a xx 4 xx c + 17 xx b xx 4 xx c`
= `-12 xx 4 xx a xx c + 17 xx 4 xx b xx c`
= `48ac + 68bc
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