if x=a-2b+c,y=2a+3b-4c and z=b-4a+c,find the expression x+y-z in terms of a,b and c
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》x+y-z = a-2b+c+2a+3b-4c-(b-4a+c)
=a+2a+3b-2b+c-4c-b+4a-c
=7a-4c
Therefore, x+y-z= 7a-4c
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》x+y-z = a-2b+c+2a+3b-4c-(b-4a+c)
=a+2a+3b-2b+c-4c-b+4a-c
=7a-4c
Therefore, x+y-z= 7a-4c
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