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Question
Subtract the second expression from the first:
x + 2y + z, - x - y - 3z
Sum
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Solution
(x + 2y + z) - (- x - y - 3z)
= x + 2y + z + x + y+ 3z
= x + x + 2y + y + z + 3z
= 2x + 3y + 4z
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