Question
Simplity: $[7 - 2x + 5y - (x - y)] - (5x + 3y - 7)$
✓
Answer
$[7 - 2x + 5y - (x - y)] - (5x + 3y - 7) $
$= (7 - 2x + 5y - x + y) - (5x + 3y - 7) $
$= 7 - 2x + 5y - x + y - 5x - 3y + 7$
$ = 7 + 7 - 2x - x - 5x + 5y + y - 3y $
$= 14 - 8x + 3y$
$= (7 - 2x + 5y - x + y) - (5x + 3y - 7) $
$= 7 - 2x + 5y - x + y - 5x - 3y + 7$
$ = 7 + 7 - 2x - x - 5x + 5y + y - 3y $
$= 14 - 8x + 3y$
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