Упрости выражения: а) -3(y +2) + 2(2y – 1); б) 8x - (2x +5) + (x– 1); в) 13b – (9b – (8b – (6-b))). г) 5а+7b-2a-8b; д) 3(4x+2)-5; е) 20b-(b-3)+(3b-10)

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