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Expression : $$5x-[\frac{1}{2}(2x-7)]=5.5$$
= $$5x-(\frac{2x-7}{2})=5.5$$
= $$\frac{10x-2x+7}{2}=5.5$$
= $$8x+7=5.5\times2=11$$
= $$8x=11-7=4$$
= $$x=\frac{4}{8}=\frac{1}{2}$$
=> Ans - (B)
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