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b) 2,5a - a - 4a + 6,5a - 3,5a =0.5a
c) 0,3x - 0,4x + 0,5x - 0,6x + 0,7 =0.5x
d)696y - 969y + 69 - 96 =-273y-27
b) 0,5a
c) 0,5x
d)-273y+(-27)