Решите уравнение
а) 1,8 × (4 - x) - 4,5 × (x + 5) = 3,6
б) 5 - 6 × | 0,5x - 2,2 | = -4

Найдите неизвестный член пропорции
а) 2,125 : 6,75 = 51 : x
б) x : 5 5/8 = 3 1/9 : 2 11/12
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