Question
How much is $x - 2y + 3z$ greater than $3x + 5y - 7$?
✓
Answer
Required expression: $= (x - 2y + 3z) - (3x + 5y - 7) = x - 2y + 3z - 3x - 5y + 7$
Collecting positive and negative like terms together,
we get $x - 3x - 2y + 5y + 3z + 7 = -2x - 7y + 3z + 7$
Collecting positive and negative like terms together,
we get $x - 3x - 2y + 5y + 3z + 7 = -2x - 7y + 3z + 7$
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