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15 · x - 81 = 6 · x

aflati-l pe x



Răspuns :

15x-81=6x
15x-6x=81
9x=81
x=81:9
x=9
15-6=9
81:9=9
x=9
Proba :15*9-81=6*9
135-81=54 Adevarat