12,108 round to nearest thousand

How do i do this activity, is appreciated

The sum of the reciprocal of a positive number and the reciprocal of 2 more than the number is 3/4 equation: the number is

This is my question~~ ( r ^ 4 - 2r ^ 3 - 23 r ^ 2 - 4r - 32)÷(r+4) ~~ i must use long division to solve it : / i was wondering if anyone world like to solve it. and if so, share step-by-step explanations! you! ❤