Question
Find an integer x such that:
$7 + x = 0$
$7 + x = 0$
✓
Answer
$7 + x = 0$
$\Rightarrow 7 + x - 7 = 0 - 7$
$x = -7$
$\Rightarrow 7 + x - 7 = 0 - 7$
$x = -7$
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