I'm probably making a silly mistake or Wolfram Alpha is lying to me.
Question: Find the value of c and d.
Rearranged, simplified and multiply each equation by 2:
Now find the common multiple which in my case I will use 12:
Then add them and find what d is worth:
Now when I plug this back into the equation, I will use the first one:
What am I doing wrong? Sorry if this is the long winded way to do it.