Ответ:
(a+b)*5+9a+3b=5a+5b+9a+3b=14a+8b
13*(a+b)-7b+4a=13a+13b-7b+4a=17a+6b
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Ответ:
(a+b)*5+9a+3b=5a+5b+9a+3b=14a+8b
13*(a+b)-7b+4a=13a+13b-7b+4a=17a+6b