Odpowiedź:
3x = 10 + 6x
9x = 10
x = 10/9 = 1 i 1/9
6x - 3 = 5x - 15
x = - 12
7x + 25x^2 + 5x = 31
12x + 25x^2 = 31
12x + 25x^2 - 31 = 0
a = 25, b = 12, c = - 31
x = (- 12 + /(12^2 - 4*25*(-31))) : 2*25
x = - 12 + /3244 : 50
x = - 12 + 2*/811 : 50
x = (- 6 + /811) : 25 v x = (- 6 - /811) :25
3x - 6x + 6 = 3x - 6
-6x = 0
x = -
