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6-75.

Rianna thinks that if a = b and c = d, then a + c = b + d. Is she correct? Homework Help ✎

If you add the same amount to both sides of the equals sign, then the equation remains true.

Adding c to one side is the same as adding d to the other because c and d are equal.

Therefore, the equation ( a + c = b + d ) is correct.