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+id = 147
+name = 'firstMinus/2'
+slug = 'negate the first element in a list of numbers'
+
+description = '''\
+<p><code>firstMinus(L1, L2)</code>: the list <code>L2</code> is the same as <code>L1</code>, except for the first element that may be negated. Your code should return both solutions.</p>
+<pre>
+ ?- firstMinus([1,2,3], L).
+ L = [1,2,3] ;
+ L = [-1,2,3].
+</pre>'''
+
+hint = {}