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Original Message (ID '198466') By Bill Simpson:
In[1]:= matx={{a,b,c},{d,e,f},{g,h,i}}; mata={{-1,-1,1},{2,3,-1},{-3,2,2}}; matb={{-1,2,-1},{1,2,-2},{2,1,-1}}; matx/.Solve[matx.mata-matb==2matx,Flatten[matx]] Out[4]= {{{3/2, 5/2, 1/2}, {3, 5, 0}, {0, 1, 0}}} Be very careful using capital letters for names and any previously assigned values to the a,b,...i