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Calculeaza:
a×4-55 =(80-75)×5


Răspuns :

ax4-55=(80-75)x5
4a-55=5x5
4a-55=25
4a=25+55
4a=80
a=80:4
a=20
ax4-55=5x5;ax4-55=25;ax4=55+25;ax4=80;a=80:4;a=20