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If (a+b+2c+3d)(a-b-2c+3d)=(a-b+2c-3d)(a+...

If `(a+b+2c+3d)(a-b-2c+3d)=(a-b+2c-3d)(a+b-2c-3d)` , then `2b c` is equal to `3/2` (b) `(3a)/(2d)` (c) `3a d` (d) `a^2d^2`

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