Упростите выражение,выделите подобные слагаемые и выполните их приведение; a)-3x+15x-12x;б)16-8y+7y-20;в)-6n+15m-m-20n;г)-2,1a-3b,-0,9a+3b;д)6,5x-2+3,5x-10x;е)-2,2k-0,5+4,2k-k
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