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This solution illustrates the repetitive nature of the REQUEST-RESPONSE-RESULT structure for solving problems. This basic problem solving organization is automatically available in
SureMath - the math software for 21st century problem
solving.
The verbal statements at each action help to stimulate the thinking process.
Notice that the Answer Book solution, while utilizing an accepted algebraic manipulation, elimination in solving simultaneous equations, provides little long-term guidance toward solving problems.
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