a/b=c/d proved ac+2b^2/bc=c^2+2bc/dc
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a/b = c/d
ac + 2b²/bc = c² + 2bc / dc
ac/bc + 2b²/bc = c²/dc + 2bc/dc
= a/b + 2b/c = c/d + 2b/d
= 2b/c = 2b/d
=>1/c = 1/d
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