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Verified answer
Mapel : MatematikaBab : Operasi Hitung Aljabar
(40n + 32m + 7) - (-25n - 20m + 9)
= 40n + 32m + 7 + 25n + 20m - 9
= 32m + 20m + 40n + 25n + 7 - 9
= 52m + 65n - 2