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Number be n for all variables
#1
[tex]\\ \tt\hookrightarrow \dfrac{n}{10}=35[/tex]
#2
[tex]\\ \tt\hookrightarrow n-5=65[/tex]
#3
[tex]\\ \tt\hookrightarrow \dfrac{n}{2}=65[/tex]
#4
[tex]\\ \tt\hookrightarrow 10n=72[/tex]
