نَحْنُ بِمَا عِنْدَنَا وَأَنْتَ بِمَا عِنْدَكَ رَاضٍ وَالرَّأْيُ مُخْتَلِفُ
We are satisfied with what we have, and you with what you have, while our opinions differ.
«نَحْنُ» is the subject of the first clause and its prepositional phrase attaches to an omitted predicate. «أَنْتَ» is the second subject. The visible «رَاضٍ» is masculine singular; it cannot simply function unchanged as the predicate of plural «نحن».
Reconstruction of the first clause: نَحْنُ بِمَا عِنْدَنَا رَاضُونَ.
The second clause: وَأَنْتَ بِمَا عِنْدَكَ رَاضٍ.
The audible predicate belongs to the second subject, while a plural corresponding predicate is supplied for the first. This demonstrates why understanding the sense without showing grammatical agreement does not finish the analysis.