Use identical left/right margins

orchestrallily.ily

@@ -1703,8 +1703,8 @@ slashedGrace =
 \paper {
   footnote-separator-markup = \markup { \fill-line { \override #`(span-factor . 1/4) { \draw-hline } \null }}
 
-  left-margin = 2\cm
-  right-margin = 1.5\cm
+  left-margin = 1.75\cm
+  right-margin = 1.75\cm
   line-width = 17.5\cm
 %   bottom-margin = 1.5\cm
   top-margin = 0.7\cm