exam Maths Puzzle Numerical Ability

c/2-d/5=-4 and c-d/5=-8 solve by substitution method

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I think I have solved majority of the division, but ran into a slight problem:

6r^4-11r^3-r^2+16r-8 divided by 2r-3

So far I have come up with 3r^3-r^2+r

I got stuck after Find the center and radius of the circle. (x+3)^2 +(y-1)^2=81