1.0 link Rainbow Dash Network http://rainbowdash.net/ orungano (tiff) http://rainbowdash.net/tiff http://rainbowdash.net/notice/2358758 Clever maths people: with simultaneous equations, if you multiply both A and B to get a C and a D, can you take D away from C or vice versa, or do you have to take away from one of the original two equations?