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Determina numarul necunoscut : 27x56+124:A-876=667

Răspuns :

1512+124:A-876=667
1512+124:A=667+876
124:A=1543-1512
124:A=124:31
A=4
27 x 56 + 124 : a - 876 = 667
1512 + 124 : a = 667 + 876
1512 + 124 : a = 1543
124 : a = 1543 - 1512
124 : a = 31
a = 124 : 31
a = 4