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Exercitiu :
7a+12b+13a+28b=20a+40b !
Multumesc !!


Răspuns :

(7a + 13a) + (12b + 28b) = 20a + 40b | 20a + 40b = 20a + 40b | Sper ca te-am ajutat!
7a +12b+13a +28b= 20a +40 b
7a+13a=20a
12b+28b=40a
20a+40b= 20a+40b.