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You need three things :

1. Activate the zoom desktop effect in system configuration > Plasma tweaks > Desktop effects

2. Install xbindsys

3. Add these lines to your .xbindsysrc

  
ychaouche#ychaouche-pc 11:36:33 ~ $ cat .xbindkeysrc
"qdbus org.kde.kglobalaccel /component/kwin invokeShortcut view_zoom_in"
    m:0x50 + c:133 + b:4
"qdbus org.kde.kglobalaccel /component/kwin invokeShortcut view_zoom_out"
    m:0x50 + c:133 + b:5
ychaouche#ychaouche-pc 11:37:12 ~ $ 

Make sure you also have qdbus but since you're running KDE it should be there, otherwise think about changing for a better distro (netrunner ?)

source : http://blaxpirit.com/blog/19/zoom-the-screen-with-alt-scroll-in-kde.html

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contact : @ychaouche yacinechaouche at yahoocom