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Simplifying means collecting like terms: all the x coefficients add together and all the constants add together. Unlike terms, such as x and x², can never be combined.
Collecting like terms
(Σaᵏ)x + (Σbᵏ) — add coefficients of matching powers only
10x + 5, which is 35 when x = 3.
They represent different powers, so they are not like terms — much as you cannot add metres to square metres.