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4x^2+y^2 -(4x^2+y^2)=
4x^2+y^2-4x^2-y^2=
4x^2-4x^2+y^2-y^2= 0 (d)
3) 8p^2+(-3q^2)+6p^2-(7q^2) =
8p^2+6p^2+(-3q^2)-(-7q^2) =
14p^2+(-3q^2)+7q^2 =
14p^2+4q^2 (d)