book Maths Puzzle Numerical Ability

y=2x+5

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Using long division to solve this. I just am not getting the correct answers. Can someone please help me? 6x^4+2x^3-3x^2+20x-22=(3x^2-2x+5)*(_____)+(_____) How do you work out the percentage increase/decrease between two figures?
Example. What is the percent increase/decrease from 41210 to 38853?