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It's funny how adults can forget things they learned way back in elementary school, like the Order of Operations. Well, use it or lose it I suppose!
Multiplication and division have equal priority and are done in the order given. Addition and subraction have the next lowest priority, equally, and are done in the order given. Thus, in 1+1-1+0 you do not bracket the additions to do first.
Yes, you are very correct calculus-geometry, Actually I try to solve this problem through step by step process, so that anyone can understand easily, and why different get different answer. You are telling is what the correct mathematics. Thank you..