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1b. c
1c. 2
2. 25a+b
3. -15i +14b-45j+64k
4. -13x+23y+35z-6
5. 62n-15m-2
6. 4x+4
7. -2y+15z-8
8. -5x-y+4
b. 0
c. 2
2. 13a-8b+12a+9b = 25a+b
3. 15i+14b+13k-30i-45j+51k= -15i+14b64k-45j
4. -13x+23y+35z-3
5. 35m-50m+42n+20n-9 = -15m+62n-9
6. 5x+3-x+1=4x+4
7. 2y+15z-4y+8 = -2y+15z+8
8. 5z+3-2z+7= 3z+10
9. x-y-6x-4= -5x-y-4