Răspuns :
[tex]a+b+c=37 \\
a-x=3 \Longrightarrow a=x+3 \\
b-x=7 \Longrightarrow b=x+7 \\
c-x=9 \Longrightarrow c=x+9 \\
Inlocuim: \\
x+3+x+7+x+9=37 \\
3x+19=37 \\
3x=18 \\
x= 18:3 \\
\underline{x=6} \\
a=6+3~~~~~b=6+7~~~~~c=6+9 \\
\boxed{a=9}~~~~~~~~\boxed{b=13}~~~~~~~\boxed{c=15}
[/tex]