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If I put a basic problem up could someone step by step take me through how they're solving the problem? I'm more than gutted to get stuck on the first freaking set of problems!

Heres one of the exercises : (a - b) + (c - d) = -(b + d) + (a + c)

Associativity = ?

Commutativity = ?

Hope somebody can link me to a good resource or talk me through this problem!