Răspuns :
[(49-x):6]*5-5=30
[(49-x):6]*5=30+5
[(49-x):6]*5=35
(49-x):6=35:5
(49-x):6=7
49-x=7x6
49-x=42
x=49-42
x=7
[(49-x):6]*5=30+5
[(49-x):6]*5=35
(49-x):6=35:5
(49-x):6=7
49-x=7x6
49-x=42
x=49-42
x=7