Well lets first look at 93+(68+7). To find the sum we need to first find out what (the) in parenthesis. 68+7=75 and with the 93 we add 93+75 which is 178 then we multiply by 0 ( to simulate the difference ) then add 89 and double that amount. That is saying that 93+(68+7) is 178.
I'm sorry I didntexactly understand what you meant by ( property ), if this is what you meant dont say anything. If this is not what you wanted me to explain please tell me and I will do everything in my power to help you.
Hope I Helped! :D
