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Help please I’m not sure what to do

Help please I’m not sure what to do-example-1
User Shavanna
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Try this solution.
The short explanation: there are 2 ways, marked by red; the goal - to evaluate the given sum of polynomials to the same algebraic expressions in the right and left sides.
Help please I’m not sure what to do-example-1
User Sushil Bharwani
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