Determine a basis for the kernal and image
Determine a basis for the kernal and image of the following linear maps:
1. T(x,y,z)=(x+2y-z, y+z, x+y-2z)
2. T(x,y,s,t)=(x-y+s+t, x+2s-t, x+y+3s-3t)
3. T(x,y,z)=(x+2y, y-z, x+2z)
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