if x/4=y/7=z/9,prove that 4x+ 3y- 4z/7x- 5x+ 3z
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if x/4=y/7=z/9,prove that 4x+ 3y- 4z/7x- 5x+ 3z
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if x/4=y/7=z/9,prove that 4x+ 3y- 4z/7x- 5x+ 3z
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