18y-5y=13y
2a+7a+9a=18а
12k-8k+16k=20k
13d+4d+15=17d+15
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18y-5y=13y
2a+7a+9a=18а
12k-8k+16k=20k
13d+4d+15=17d+15
2)18а;
3)20к;
4)17d+15;