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Add & subtract polynomials challenge

C=3y2+4y+4D=βˆ’7y2+3yβˆ’6\begin{aligned} &C = 3y^2+4y+4 \\\\ &D = -7y^2+3y-6 \end{aligned}
Dβˆ’C=D-C=

Your answer should be a polynomial in standard form.