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42n +20n +35m- 50m +7-9
22n -15m -2
=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,,