6d
If -6d = 42 then 6d = -42. then divide by 6, d = -7
Three Shillings and Sixpence (3/6d) GBP in 1818 had the purchasing power of about £9.38 GBP today. NOTE - This historical conversion is the result of many calculations and considerations by a purpose designed program for which I can take no credit. The resulting answer should only be regarded as an approximation.
-6d = -42-6(7) = -42d = 7
72-6d=6 subtract 72 from both sides -6d=66 divide by -6 d=-11
yes you can
9d-19=6d+2 ... add 19 to both sides and subtract 6d from both sides... 9d-6d=2+19 3d=21 d=21/3 d=7
The pressure test for API 598 is slightly less pressure and less duration than API 6D. API 6D is specifically for pipeline valves.
API 6D exceeds API 598 in both pressure and duration.
6d = c Divide both sides by 6: d = c/d
3c - 4d = 6d + 4c Subtract 4c from both sides: -c - 4d = 6d Add 4d to both sides: -c = 10d or c = - 10d
About 2GBP. Let's see if my memory from my childhood then can help with this: I can tremember the Mars Bar costing 6d and the Milky Way was 3d (12 d = 1 Shilling) Now quite when this was is another Q, but it would be in the early 1960s at some stage.... A Mars Bar today is going to cost about 50p (Which is 10 shillings) so there are about 4 in £2. Therefore the above, at least as far as comparison with the Mars Bar, is correct ! Of course, those carrots your grandmother bought, left on the shelf, and forgot about are now worth zero.