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[tex]\\ \sf\longmapsto 6w+3-(2w+3)[/tex]
[tex]\\ \sf\longmapsto 6w+3-2w-3[/tex]
[tex]\\ \sf\longmapsto 6w-2w+3-3[/tex]
[tex]\\ \sf\longmapsto 4w[/tex]
Your friend has sold 4w more coupons .