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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
contact : @ychaouche yacinechaouche at yahoocom