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a fost răspuns

calculeaza 27+27:3:3-2×a=10+6:3

Răspuns :

27+9:3-2xa=10+2
27+3-2xa=12
30-2xa=12
2xa=30-12
2xa=18
a=18:2
a=9

verificare
27+27:3:3-2x9=10+6:3
27+9:3-18=10+2
27+3-18=12
30-18=12

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