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(3u - 6v) + (6v - 5) = 3u - 6v + 6v - 5 = 3u - 5
(8u + 3v) - (2u + 5v) = 8u + 3v - 2u - 5v = 6u - 2v
(-a - 4b) + (5b - a) = -a - 4b + 5b - a = b - 2a
(7a - b) - (4a - 2b) = 7a - b - 4a + 2b = 3a + b
b) 8u +3v - 2u - 5v = 6u - 2v
c) -a -4b + 5b - a = -2a + b
d) 7a - b - 4a + 2b = 3a + b