(1.8-8x)/1.2-(1.3-3x)/2-(5x-0.4)/0.3=0
(18-80x/12-(1.3-3x)/2-(50x-4)/3=0
1.5-20/3x-0.65+3/2x-50/3+4/3x=0
-20/3x+3/2x+4/3x=50/3+0.65-1.5
-23/6x=949/60
x=-949/230
(1.8-8x)/1.2-(1.3-3x)/2-(5x-0.4)/0.3=0
(18-80x/12-(1.3-3x)/2-(50x-4)/3=0
1.5-20/3x-0.65+3/2x-50/3+4/3x=0
-20/3x+3/2x+4/3x=50/3+0.65-1.5
-23/6x=949/60
x=-949/230
25/93