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Given: x+y=z, w+v=z, w=y; prove x=v
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Given: x+y=z, w+v=z, w=y; prove x=v

User Lakshmaji
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since z = w + v and x + y, set w + v = x + y
since w = y, you can substitute either or for one another (ex: w + v = x + w)
since w = w, you can cancel them out, leaving you with v = x
User Lee Maan
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