$x y + 2 y z - 3 x z = 2 y z -$ ( ___)

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Solution

When any part of an expression is inserted within a pair of brackets with a positive sign before it, the sign of each term inside the brackets remains unchanged. When any part of an expression is inserted within a pair of brackets with a negative sign before it, the sign of each term inside the brackets changes.

So, $x y + 2 y z - 3 x z = 2 y z - (- x y + 3 x z)$

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