Question

if 1/a-1/b=1/c+1/d find the value of c when a= 1/2 b=1/4 d=-1/5

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Answer 1

$\frac{1}{ \frac{1}{2} } - \frac{1}{ \frac{1}{4} } = \frac{1}{ \frac{1}{c} } + \frac{1}{ \frac{ - 1}{5} } \\ = - 2 = c + ( - 5) \\ = - 2 + 5 = c = 3$