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x = 173
x+x-39=307
2x=307+39
2x=346
x=346:2
x=173
173-39=134
x- liczba znaczków Kuby
razem- 307
x+x+39=307
2x+39=307
2x=307-39
2x= 268 /:2
x= 134
134 +39= 173
Odp. Tomek miał 173 znaczki, a Kuba 134 znaczki
Chyba dobrze.. :)