A) + 1
B) - 1
C) + 6
D) 0
Correct Answer: A
Solution :
\[\overset{*\,\,\,\,\,\,\,\,\,}{\mathop{{{S}_{2}}C{{l}_{2}}}}\,\] \[2x+2(-1)=0\]; \[2x-2=0\] \[x=+1\].
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