g(x) = 2x + 1
h(x) = x + 2x
(g + h)(x) = (2x + 1) + (x + 2x)
(g + h) (x) = 2x + 1 + x + 2x
(g + h) (x) = 2x + 2x + x + 1
(g + h)(x) = 5x + 1 Result
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