2x(M-x）=6x²y³+Nx²,
2Mx-2x²=6x²y³+Nx²,
2Mx=6x²y³,M=3xy³,
-2=N,
M+N=3xy³-2
已知单项式M、N满足等式：2x(M-x）=6x²y三次方+Nx²,求M、N.
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