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Cat face 30+a-36=17 te rrrrrrrroooooooooog!!!!!!

Răspuns :

30+a-36=17
30+a=36+17
30+a=53
a=53-30
a=23
30+a-36=17
30+a=36+17
30+a=53
a=53-30
a=23
Verificare:30+23-36=
53-36=
17
SPER CA TE-AM AJUTAT!!!!!!!!