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primer paso agrupar términos semejantes
7a+6a -9b-4b a-a b-b -c-c+2c
resolvemos a-a b-b -2c+2c
13a - 13b 0a 0b 0c = 0
c) 5x-11y-9+20x-1-y d)-6m+8n+5-m-n-6m-11
5x+20x -11y-y -9-1 -6m-m-6m +8n-n 5-11
25x-12y-10 -13m+7n-6