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= 2x + 8x + 3y - 5y - 5 - 4
= 10x - 2y - 4
(3x + 6 - 2y) - (x - 5y + 7)= 3x - x + 6 - 7 - 2y + 5y
= 2x - 1 + 3y
(4p-5q+3)(2p-3) = 8p" - 12p - 10pq + 15q + 6p - 9
(4p-5p+3)(2p-3) = 6p -12p -10p + 15 +6p -9 =6p-12p-10p+6p + 15 -9 = -10p + 6