Explanation:
= 2x + 3 ( - 6x - 8 ) + 4y - 3 ( 8y + 2 )
= 2x - 18x - 24 + 4y - 24 y - 6
= 2x - 18x + 4y - 24y - 24 - 6
= - 16x - 20y - 30..
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