taking away

using each of the numbers 2 , 8 , 10 and 14,
can you replace the symbols to make this statement true?

there are four different solutions

choose any four numbers for a, b , c and d so that they increase by a regular amount (i.e. are in an arithmetic sequence)

• what is the value of (a - b) - (c - d) in general?
• what is the value of (b - a) - (c - d) in general?
• other expressions e.g (d - a) - (b - c)