Let years be x
[tex]\\ \tt\hookrightarrow 130.41-1.61x=70.84[/tex]
[tex]\\ \tt\hookrightarrow 1.61x=130.41-70.84[/tex]
[tex]\\ \tt\hookrightarrow 1.61x=59.57[/tex]
[tex]\\ \tt\hookrightarrow x=59.57/1.61[/tex]
[tex]\\ \tt\hookrightarrow x=37years[/tex]