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a) (2x +1) + (3x+2)
b) (25x - 2y) - (15x - 3y)
c) - (4a -b) - (3a + 2b) + (6b + 3a)
d) (1,5 a + 0,5b) - (a-b) + (1,2b - 4a) - (-2a + 1,4b)​