Odpowiedzi

2010-02-10T18:40:51+01:00
5 - 10x = -2x
5 = 8x |8
5/8 = x

13+2x=3
2x = -10 |:2
x = -5
2010-02-10T18:41:59+01:00
1) 5 - 10x= -2x
5 = -2x + 10x
8x = 5
x = ⅝

2) 13 + 2x=3
2x = 3 - 13
2x = -10
x = -5