Question 111018
{{{((1/x) -( 1/b)) / ((1/xb) + (1/2))}}} I assume this is the problem.
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={{{((b-x)/(xb))/((2+xb)/2xb))}}}
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={{{((b-x)/(xb))*(2xb/(2+xb))}}}
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={{{(b-x)*(xb/(2+xb))}}}
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={{{(b^2x-bx^2)/(2+xb)}}}
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Ed