from the sum of 5 x + 7 Y - 12 and 3 x - 5 Y + 2, and subtract the sum of 2 x - 7 Y - 1 and - 6 X + 3 Y + 9.
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Step-by-step explanation:
((5X+7Y-12) +(3X-5Y+2)) - ((2X-7Y-1)+(-6X+3Y+9))
(8X+2Y-10) - (-4X-4Y+8)
8X + 2Y - 10 + 4X + 4Y - 8
12X + 6Y - 18
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