Упростите выражение: а) 4 х – 6 х – 3 х + 7 + х б) – 8(у - 3) + 4(у - 2) – 2(3 у + 1) в) ⁵⁄₉ (3,6 а – 3 ³⁄₅ в) – 3,5( ⁴⁄₇ а – 0,2 в). 
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