Question 723137
(1/5x^3+2x^2-3/10)-(-2/5x^3+2x^2+7/1000) 
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Gather the "like" terms:
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((1/5)+(2/5)x^3 + (2-2)x^2 + ((-3/10)-(7/1000))
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= (3/5)x^3 + 0*x^2 + ((-300/1000)-(7/1000))
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= (3/5)x^3 - (307/1000)
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Cheers,
Stan H.