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Afla nr necunoscut 279 ×3-a=379
a+29×56=5142
29×56+a=6000
a-153×25=4


Răspuns :

279x3-a=379
837-a=379
a=837-379
a=458

a+29x56=5142
a+1624=5142
a=5142-1624
a=3518

29x56+a=6000
1624+a=6000
a=6000-1624
a= 4376

a-153x25=4
a-3825=4
a=4+3825
a=3829