$$M^{T}MY + \lambda Y = D$$ M, Y, D are matrix, $\lambda$ is scalar value, Y and D have the same dimension.
M and D is known, how to solve Y.
$$M^{T}MY + \lambda Y = D$$ M, Y, D are matrix, $\lambda$ is scalar value, Y and D have the same dimension.
M and D is known, how to solve Y.
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HINT
LHS is equivalent to $(M^T M + \lambda I) Y = D$