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1 = x²/2,5 - 1,25x - 2x + x²
1= x²/ 2,5 -3,25x + x² |*2,5 -3,25x + x²
2,5 -3,25x + x² = x²
- 3,25x = - 2,5 | : -3,25
x = 0,76923077
2,5 - 1,25x - 2x + x² = x²
-3,25x = -2,5
3.25x = 2,5
x ≈ 0,78