( x + 1 ) + ( x + 3 ) + ( x + 5 ) + ........+ (x + 99 ) = 0 ( x - 3 ) × ( 2y + 1 ) = 7 ( x + 3 ) × ( x^2 +1 ) = 0 ( x + 5 ) × ( x^2 - 4 ) = 0 3x + 4y - xy = 15

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