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If x + y = 3, and y + z= 6, then x - z = ____?

If x + y = 3, and y + z= 6, then x - z = ____?

Explanation

Given:

x + y = 3 ... (1)

y + z = 6 ... (2)

Subtract (1) from (2):

(y + z) - (x + y) = 6 - 3

z - x = 3

x - z = -3