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Developer`LinearExpressionToMatrix
 LinearExpressionToMatrix[expr, vars] gives  m, c where m . vars - c == expr.
LinearExpressionToMatrix[expr] deduces variables using Variables[expr].
expr must be a linear function of the variables vars.
LinearSolve[m, c] gives the solution to Thread[expr == 0].
With the option WorkingPrecision -> n explicit numbers with more than n digits of precision are reduced to n-digit precision.
See also: LinearExpressionToSparseMatrix, CoefficientList.
Further Examples
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