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Add & subtract polynomials: two variables

Problem

M=5w47w2z23z4N=w4+13w2z24z4\begin{aligned} &M = 5w^4-7w^2z^2-3z^4 \\\\ &N = -w^4+13w^2z^2-4z^4 \end{aligned}
M, plus, N, equals

Your answer should be a polynomial in standard form.
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