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x²;+bx/a=-c/ax²;+bx/a+b²;/4a²;=-c/a+b²;/4a²;(x+b/2a)²;=(b²;-4ac)/4a²;x+b/2a=±√(b²;-4ac)/2ax=[-b±√(b²;-4ac)]/2a
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