(а-3b)/b =4 ⇒ a -3b=4*b ⇒ a=7b
(4a+5b)/ a= (4*7b+5b)/ 7b = 33b/7b =33/7 =4 5/7
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(а-3b)/b =4 ⇒ a -3b=4*b ⇒ a=7b
(4a+5b)/ a= (4*7b+5b)/ 7b = 33b/7b =33/7 =4 5/7