exam Maths Puzzle Numerical Ability

I need help with this equation

n-(8+4n)=2(3n-4)

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exam Other Question

For the following function, C computes the cost in millions of dollars of implementing a city recycling project when x percent of the citizens participate.
C(x)= 1.4x/(100 - x) the segments GA and BG are tangent to a circle at A and B, and AGB is a 48 degree angle. Given that GA = 12 cm, find the distance from G to the nearest point on the circle.