1.

A+b/x + a-b/x = 2a x=?

Answer»

\frac{a+b}{x}  +  \frac{a-b}{x}  = 2a \\  \frac{a+b+a-b}{x}  = 2a \\  \frac{2a}{x}  = 2a \\  \frac{2a}{2a}  = x \\ x = 1

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