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X-9=20+2 ????????????

Răspuns :

x-9 =22
x=22 +9
x=31
31-9 =22
[tex]x - 9 = 20 + 2 = \ \textgreater \ x - 9 = 22 = \ \textgreater \ x = 22 + 9 = \ \textgreater \ \boxed{\boxed{ x = 31 }} = \ \textgreater \

\underline{S = 31}[/tex]