line 1: -9.3x +8.6y =45.1 or -93x +86y=451 or -6603x +6106y =32,021
line 2: 7.1x +1.7y =-17.9 or 71x +17y =-179 or +6603x +1581y= -16,647
line 1+line 2...7,687 y=15,374
y=15374/7687
y=2
rewerk line 1...6106y=12212 & 6603x=12212-32021=-19809
so x=-19809/6603=-3