Question: 6.1 Write a procedure simplify to symbolically simplify summation expressions with numbers and symbols (lower-case letters). Let the procedure rearrange the expressions so that all

6.1 Write a procedure simplify to symbolically simplify summation expressions with numbers and symbols (lower-case letters). Let the procedure rearrange the expressions so that all the symbols precede numbers. These are examples of its use:

?- simplify(1+1+a, E). E = a +2 ?- simplify(1+a+4+2+b+c, E). E=a+b+c+7 ?- simplify( 3+ x + x, E). E = 2*x + 3

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