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349 +6× a + 6× b +6 ×c - 12 × x

Răspuns :

349+6a+6b+6c+12x=
=349+6a+6b+6c+6•2x=
=349+6(a+b+c+2x)

Metoda factorului comun.
349+6a+
6b+6c+12x=
=349+6a+6b+6c+6•2x=
=349+6(a +b+c+2x)