Упростите выражение и найдите его значение: 1) 7а+15а при а=3;
2) 23b+16b при b=8;
3) 44х-18х при х=5;
4) 14у+33у-45у при у=17;
5) 52m-25m+45m при m=9;
6) 18n+34n-22n при n=6;

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