Question

answer the question

Answer 1

just add the constant terms.
i) 6x
ii) (3/5+2/3-4/5)x=13x/15
and other questions similar

Answer 2

$(vi) \: {2x}^{2}-{3y}^{2}+{5x}^{2}+{6y}^{2}-{3x}^{2} \\ -{4y}^{2}={4x}^{2}-{y}^{2}$
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