sqrt(5)*|4*x - 8*y - 4|/20
___ \/ 5 *|4*x - 8*y - 4| --------------------- 20
___ \/ 5 *|1 - x + 2*y| ------------------- 5
sqrt(5)*|1 - x + 2*y|/5
___ \/ 5 *|4 - 4*x + 8*y| --------------------- 20
sqrt(5)*|4 - 4*x + 8*y|/20
___ \/ 5 *|4*x - 8*y - 4| --------------------- 20
sqrt(5)*|4*x - 8*y - 4|/20