Решите уравнения:
а) 8 · (3 – 2х) + 5 · (3х + 5) = 9 ;
б) -7· (0,3х – 8) + 3 · (0,4х + 5) = 8;
в) 0,4 · (6х – 7) – 0,5 · (3х + 7) = 0 .
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