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Let the no be x
ATQ
[tex]\\ \sf\longmapsto 2x+5=13[/tex]
[tex]\\ \sf\longmapsto 2x=13-5[/tex]
[tex]\\ \sf\longmapsto 2x=8[/tex]
[tex]\\ \sf\longmapsto x=\dfrac{8}{2}[/tex]
[tex]\\ \sf\longmapsto x=4[/tex]