9N refers to a force of 9 Newtons. Newton is the unit of measurement for force in the International System of Units (SI). One Newton is defined as the force required to accelerate a mass of one kilogram at a rate of one meter per second squared. So, 9N indicates a force equivalent to the weight of a mass of approximately 0.9 kilograms under Earth's gravity.
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8m + (4n - 6m) + 9n =8m + 4n - 6m + 9n =(8m - 6m) + (4n + 9n) =2m + 13n
-5 plus 9n plus 6 is 1 plus 9n.
9n-2=7n+50 7n+9n=50+2 16n=52 n= 3.25
9n+6-3n
n - 10 + 9n - 3 = 10n - 13