Odpowiedź :
x - 3x + 1/4 = 1/5
-2x + 1/4 = 1/5
-2x = 1/5 - 1/4
-2x = - 1/20 / : - 2
x = 1/40
X - 3x + 1/4 = 1/5
-2x = 1/5 - 1/4
-2x = 4/20 - 5/20
-2x = -1/20. /:(-2)
x = 1/40
-2x = 1/5 - 1/4
-2x = 4/20 - 5/20
-2x = -1/20. /:(-2)
x = 1/40