Answer:
-3x^3+8x-6
step
p-q=5x^4+4x-3-(5x^4+3x^3-4x+3)=5x^4+4x-3-5x^4-3x^3+4x-3
=5x^4-5x^4-3x^3+4x+4x-3-3
=-3x^3+8x-6
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