Răspuns :
a/b+c/b=7
a+c=56=> a=56-c
inlocuiesti pe a si vine
(56-c)/b+c/b=7
(56-c+c)/b=7
56/b=7 => 7b=56=> b=8
a+c=56=> a=56-c
inlocuiesti pe a si vine
(56-c)/b+c/b=7
(56-c+c)/b=7
56/b=7 => 7b=56=> b=8
a:b+c:b=7<=>a/b+c/b=7=>a+c=7b
{a+c=7b|
{a+c=56|=>
=>7b=56=>b=8