Simplify the expression

(5x^4-3x^3+6x) - (3x^3+11x^2-8x)

5x^4-3x^3+6x-3x^3+11x^2-8x

5x^4-6x^3-11x^2+14x

is this correct?

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Write 0.27227222722227 ... as a fraction

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