Question

8ktar=r-2y solve for r

Answer 1

`8ktar=r-2y\ \ \ |-r\\\\8ktar-r=-2y\\\\r(8kta-1)=-2y\ \ \ |:(8kta-1)\\eq0\\\\r=(-2y)/(8kta-1)\to r=(2y)/(1-8kta)`

Example from comment:

`8k+ar=r-2y\ \ \ |-8k\\\\ar=r-2y-8k\ \ \ |-r\\\\ar-r=-2y-8k\\\\r(a-1)=-2y-8k\ \ \ |:(a-1)\\eq0\\\\r=(-2y-8k)/(a-1)\to r=(-(2y+8k))/(-(1-a))\to r=(2y+8k)/(1-a)`