Решите уравнение: а) 3,5x - 2,3x + 3,8 = 4,28; б) 4,7y - (2,5y + 12,4) = 1,9; в) (8,3 - k) * 4,7 = 5,64; г) (9,2 - m) * 3,2 = 16.
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