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diff --git a/911/CH5/EX5.7/ex_5_7.sce b/911/CH5/EX5.7/ex_5_7.sce
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+// example 5.7//
+clc
+//clears the screen//
+clear
+//clears all existing variables//
+disp("we can SIMPLIFY the given equation as : ");
+disp('A''B+AB''=((A''B)''''+(AB'')'''')[INVOLUTION LAW]' );
+disp('   ={(A''B)''.(AB'')''}''[DEMORGAN'' LAW]')
+disp('[{B(AB)''}''{A(AB)''}'']''')
+\ No newline at end of file