а) = (87а - 56а) - (99d - 24d) = 31a - 75d
б) = (3,78у - у) - (0,56х - 0,1х) = 2,78у - 0,46х
в) = (14n - 9n) - (15m - 8m) = 5n - 7m
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а) = (87а - 56а) - (99d - 24d) = 31a - 75d
б) = (3,78у - у) - (0,56х - 0,1х) = 2,78у - 0,46х
в) = (14n - 9n) - (15m - 8m) = 5n - 7m