Good day, I'm using verion 12 (no need to upgrade) and am creating a spring calculation shhet. I ran into a curious phenomenon and can't quite understand it. I set upan equation to find the wire diameter "d" using the Symbolic Solve functionality. See attached SCS1a & SCS1b worksheets. Prior to the equation, I defined the units of "d" to be in 'mm' (yellow hightlighted regions). With this enabled, I get two (2) answers. With it disabled, I get four (4) answers, 2- complex. The funny thing is either way I get the proper units out, but the value is different. Why? TIA Mark P.S. I've also tried to difine this as a Solve Block, but I'm haveing some difficulty remembering the exact syntax (SCS1 worksheet)