Răspuns :
(x:6-528)+307=517 => x:6-528=517-307
=> x:6-528=210
=> x:6=528+210
=> x:6=310
=> x=310x6
=> x=1860
310 inmultit cu 6
=> x:6-528=210
=> x:6=528+210
=> x:6=310
=> x=310x6
=> x=1860
310 inmultit cu 6
(x*3+47)-315=149
(x*3+47)=315+149=464
x*3=464-47
x*3=417
x=417:3
x=139