Science of Math
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Putting two things together weighs the same in either order
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Principle, equality
Builds on
If one thing equals another, the second equals the first
Write down what is on each side of the scale
Leads to
Changing order or grouping does not change a sum
Lessons
Lesson 4: A + B = B + A · Make it balance.
Lesson 4: A + B = B + A · Write down what you see
Lesson 4: A + B = B + A · The fourth identity
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