No 4 – 9 tolong…!!

4. (42n + 35m + 7) – (50m – 20n +9)
42n +20n +35m- 50m +7-9
22n -15m -2

4.(42n+35m+7)-(50m-20n+9)
   =42n+35m+7-50m+20n-9
   =42n+20n+35m-50m+7-9
   =62n-15m-2

5.(5x+3)-(x-1)
   =5x+3-x+1
   =5x-x+3+1
   =4x+4

6.(2y+15z)-(4y-8)
   =2y+15z-4y+8
   =2y-4y+15z+8
   =-2y+15z+8

7.(5z+3)-(2z-7)
   =5z+3-2z+7
   =5z-2z+3+7
   =3z+10

8.(x-y)-(6x+y)
   =x-y-6x-y
   =x-6x-y-y
   =-5x-2y

maaf klo salah,,