exam Maths Puzzle Numerical Ability

The set of real numbers between 2 and 6

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exam Other Question

Twice the sum of a number and -6 equals -6 times the sum of the number and 4. Let n stand for the number. Solve for n. OK I lied I have one more that i dont understand.

-12 divided by 0 -12/0

Would this simply be undefined?? Maybe?