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3x / 4 + 2x + 3x / 20 = 5 / 4 + 1 / 5
15x / 20 + 40x / 20 + 3x / 20 = 25 / 20 + 4 / 20
58x / 20 = 29 / 20
2x = 1
x = 1 / 2
x - (5x - 1) / 3 - 4x = - 3 / 5
3x / 3 - 5x / 3 + 1 / 3 - 12x / 3 = - 3 / 5
3x / 3 - 5x / 3 - 12x / 3 = - 3 / 5 - 1 / 3
- 14x / 3 = - 9 / 15 - 5 / 15
- 14x / 3 = - 14 / 15
x = 1 / 5