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= 42n+35m+7-50m-(-20n)-(-9)
=42n+35m+7-50m+20n+9
=35m-50m+42n+20n+7+9
= -15m+62n+16
5. (2y+15z)-(5x+3)
=2y+15z-5x-3
=-5x+2y+15z-3
sekian, maap klo ada yg salah
semoga bermanfaat :D