Решите уравнение:

б. 2,1 · (4 – 6y) = – 42;
в. 0,4 · (x − 3) + 2,5 = 0,5 · (4 + x);
г. 4/5 (1 1/4x + 5/9) −3/4 (4/21x − 1/6) = 1 2/5.
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