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b. 2/(2x+3) + 1/(3+2x) = 25
2(3+2x) + 1(2x+3) = 25(2x+3)(3+2x)
6 + 4x + 2x + 3 = 25(6x + 4x² +9 + 6x)
6x+9 = 25(4x² + 12x + 9)
6x +9 = 100 x² + 300x + 225
100x² + 300x - 6x + 225 - 9 = 0
100x²+ 294 x + 216 =0
50 x² + 147 x + 108 = 0