Решите уравнение:
а) 4x = 21 + x;
б) 0,6x – 9,8 = 6,2 – 0,2x;
в) ;
г) (6 – 5x) – (14 – 8x) = -21;
д) 0,3(4 – 3y) = 2,5 – 0,5(y – 7).
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