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= 3 - 9 -17x + 4x + 23y + 35z
= - 6 - 13x + 23y + 35z
2. =(42n +35m +7)-(50m - 20n +9)
= 42n + 20n + 35m - 50m + 7 - 9
= 62n - 15m - 2
3. = (5x + 3 ) - (x - 1)
= 5x - x + 3 + 1
= 4x + 4
4.= (2y + 15z ) - (4y - 8)
= 2y - 4y + 15z + 8
= - 2y + 15z + 8
5.= ( 5z + 3) - (2z -7)
= 5z - 2z + 3 + 7
= 3z + 10
6. = (x - y) - ( 6x + 4 )
= x - 6x - y - 4
= - 5x - y - 4