book Maths Puzzle Numerical Ability

Instructions: For questions 30 and 31 use quadrilateral DEFG inscribed in the circle. If m < GFE = 2x, m < FGD = 2x-12 and m < EDG = 2x + 20 find each measure.
Problems: 1. m < GF

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Find an equation for the line that passes through (1,-4) and has slope -3/4 x^-6x+9=0