X+10y-z+2x-3y+z what is the answer

2 answers:

7 0

x+10y-z+2x-3y+z
=x+2x+10y-3y+z-z (positive and negative 'z' will cut)
=3x+7y

3 0

You have to add/subtract all the common variables the answer is 3x+7y

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