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– a – b – c is same as – a – (________).

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x + y + z is an expression which is neither monomial nor ________ .

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If (x²y + y² + 3) is subtracted from (3x²y + 2y² + 5), then coefficient of y in the result is _______ .

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The unlike terms in perimeters of following figures are ______ and _____.

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On adding a monomial ________ to – 2x + 4y² + z, the resulting expression becomes a binomial.