Answer :

1) 8v+w+7-8v+2w

=w+7+2w

=3w+7

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2) 4c^2+6c-3c^2-2c-3

=c^2+6c-2c-3

=c^2+4c-3

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3) z^3+5z+3z^2+1-4-2z^2

=z^3+z^2+5z+1-4

=z^3+z^2+5z-3

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