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3x²+20x-7 = 11+20(2x+3)

3x² + 20x -7 = 11+ 40x + 60

3x² + 20x - 7 = 40x +71

3x² + 20x -7 - 71 = 0

3x² + 20x - 78 = 0

Solve the equation using quadratic formula. By finding its discriminant, this equation can not be factored.

a = 3; b = 20; c= -78