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-8b+9b= 1b
= 13a+12a-8b+9b
= 25a+b
2. (15i+14b+13k) + (-30i-45j+51k)
= 15i-30i+13k+51k-14b-45j
= -15i+64k-14b-45j
3. (3-17x+35z) + (4x+23y-9)
= 3-9-17x+4x+35z+23y
= -6-13x+35z+13y
4. (4n+35n+7) - (50m-20n+9)
= 4n-20n+35n-20n+7+9
= -19n+16
5. (5x+3) - (x-1)
= 5x-x+3-1
= 4x+2
6. (2y+5z) - (4y-8)
= 2y-4y+5z-8
= -2y+5z-8
7. (5z+3) - (2z-7)
= 5z-2z+3-7
=3z-5
8. (x-y) - (6x+4)
= x-6x-y+4
= -5x-y+4