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x <> 0, y <> 0, z <> 0
Â¦ y + z Â¦ = Â¦ y Â¦ + Â¦ z Â¦ possible only when y and z have same sign â€“ either both positive or both negative.
The expression x (y + z) can be zero only when y + z is 0 because x can never be 0 (As xyz <> 0)
But (y + z) is not 0 because both y and z has same sign.