раскройте скобки и приведите подобные слагаемые:
а) - ( 0,85a - 0.7b + 2,1a ) + ( a - 0.65b );
б) 5/12 · ( 4.8x - 1.2y ) - 3.6 · ( 2/9x + 7/12y).
Помогите пожалуйста!
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