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42n + 35m + 7 + 50m + 20n -9
42n + 20n + 35m + 50m + 7 -9
62n + 85m -2
Semoga membantu
=( 42n+35m+7) + (50m+20n-9)
= 42n+20n+35m+50m+7-9
= 62n+85m-2
semoga berhasil