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2. -15i-31b+64k
2.(15i+14b+13k)+(-30i-45j+51k)=-15i+14b-45j+64k
3.(3-17x-35z)+(4x+29y-9)=-13x-35z+29y-3
4.(42n+35m+7)-(50m-20n+9)=62n-15m-2
5.(5x+3)-(x-1)=4x+4
6.(4y-8)-(2y+15z)=2y-8-15z
7.(5z+3)-(2z-7)=3z+9
8.(x-y)-(6x+4)=-5x-y-4