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Developer`LinearExpressionToSparseMatrix
 LinearExpressionToSparseMatrix[expr, vars] gives  s, c where s is a sparse representation of the matrix m such that m . vars - c == expr.
LinearExpressionToSparseMatrix[expr] deduces variables using Variables[expr].
expr must be a linear function of the variables vars.
The sparse representation of a matrix m has the form    ,   -> ,   ,   -> , ...  where m[[ ,  ]] =  and all unspecified elements are zero.
Developer`SparseLinearSolve[s, c] gives the solution to Thread[expr == 0].
See also: Developer`LinearExpressionToMatrix.
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