0.0114542-0.0248376x1+0.0151062x2+0.00243125x3-0.0159438x4=0
(1)
0.00500417+0.0151062x1-0.00985015x2-0.00485625x3-0.00545625x4=0
(2)
0.00377917+0.00243125x1-0.00485625x2-0.0266501x3-0.00030625x4=0
(3)
0.0117375-0.0159438x1-0.00545625x2-0.00030625x3-0.0185501x4=0
(4)