N/-2-1=9 ????

(n/-2) - 1 = 9

we'd cross the -1 over the equality sign making it +1

so we'd have,

(n/-2) = 9 + 1

which gives;

(n/-2) = 10

open the brackets

n/-2 = 10

to solve for n, we cross multiply both sides remembering that 10 is the same as 10/1

so we'd have;

n * 1 = -2 * 10

giving

n = -20

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