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#244596 ·published 2006-11-09 23:34 UTC
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x = y - z

x(x - y) = (y - z)(x - y)

x^2 - xy = xy - y^2 - xz + yz

x^2 - xy + xz = xy - y^2 + yz

x (x - y + z) = y (x - y + z)

dividing both sides with (x - y + z)... => x=y