x/a+u/b=2 ax/by=a²-b² by cross multiplication
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x/a+u/b=2 ax/by=a²-b²
=x/a+u/b=2
=ax/by=a²-b²
x/a+u/b=2 ax/by=a²-b² +45 = x/a+u/b=2
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