add. -6z+4x+3y,-3y-4z,2x+4y-7 and 13x-3y+5z+7
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Answer:
-6z+(-4z)+5z+4x+2x+13x+(-3y)+4y+(-3y)+7+(-7)
= -10z+5+19x+(-6y)+4y
= -5z+19x-2y
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