7. (a) If 2x = 3y = 4z, find (x + y +z) : (x - y +z)
(b) If 3x = 5y = 4z, find (2x + y-z): (x +2y+z).
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7. (a) If 2x = 3y = 4z, find (x + y +z) : (x - y +z)
(b) If 3x = 5y = 4z, find (2x + y-z): (x +2y+z).
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