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the unknowns must be the same variable and the exponents have to be the same.

examples)

x4 + y4 cannot be added because they are not the same variable.

x3 + x2 cannot be added because they have different exponents.

3y6 + 5y6 can be added because they have the same variable and exponents.

(answer: 8y6)

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16y ago

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