sum of 3x-[2y-2(1 - 4x)] and 3y-4(3-5x)
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3x - [2y - 2 (1 - 4x)] + 3y - 4 (3 - 5x)
= 3x - [2y -2 + 8x] + 3y - 12 + 20x
= 3x - 2y - 2 + 8x + 3y - 12 + 20x
= (3 + 8 + 20)x + (-2 + 3)y + (-2 - 12)
= 31x + y - 14
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