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(x:6-528)+307=517
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Răspuns :

x:6-528=517-307
x:6-528=210
x:6=210+528
x:6=738
x=738:6
x=123
(x:6-528)=517-307
(x:6-528)=210
x:6=528+210
x:6=738
x=738 ori 6
x=4428