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afla nr necunoscut
[x:3-3]x9=306


Răspuns :

[x:3-3]x9=306
x:3-3=306:9
x:3-3=34
x:3=34+3
x:3=37
x=37x3
x= 111
PROBA: [111:3-3]X9=306
(x:3-3)*9=306
x:3-3=306:9
x:3-3=34
x:3=34+3
x:3=37
x=37*3
x=111