exam Maths Puzzle Numerical Ability

The solutionof 2x+1=3 may be represented by

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exam Other Question

((-6.9+7.7)/-2 )+1

OK this one I am totally LOST. I do not no what any of this means what is the (( and the /-2 mean?? I cant even find this in my textbook. Can someone please explain to me how this problem is actually work out? Thank you much. Thirty-eight teams are in a tournament. If each team plays every other team only once, then how many games will occur?