Determina numarul a stains ca a+3 supra27-12supra 27=10supra27

[tex] \frac{x + 3}{27} - \frac{12}{27} = \frac{10}{27} [/tex]
[tex] \frac{x + 3 - 12}{27} = \frac{10}{27} [/tex]
[tex] \frac{x - 9}{27} = \frac{10}{27} [/tex]
[tex]x - 9 = 10[/tex]
[tex]x = 10 + 9 = 19[/tex]