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= 42n + 35m + 7 +50m +20n -9
= 42n+20n+35m+50m+7-9
=62n+85m-2
3.b. (5x+3)-(x-1)
= 5x+3 -x+1
=5x-x+3+1
=4x+4
3.c. (2y+15z)-(4y-8)
=2y+15z-4y+8
-2y+15z+8
4.5z+3 - (2z-7)
= 5z+3 -2z+7
=3z+10
5.6x+4 - (x-y)
= 6x+4 -x+y
5x+4+y
Maaf kalo ada salah,dikoreksi kembali ya