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13 + 3x + 27 = -9 -x
4x = -49 |: 4
x = - 12,25
b)3x + 2 2x + 1
--------- = ------- (NIE WOLNO DZIELIĆ PRZEZ 0 !! )
4 0
3/4x + 1/2 = 0
3/4x = -1/2 |: 3/4
x = - 2/3
c)15x -12
-------- = 2x |*6
6
15x- 12 = 12x
15 - 12x = 12
3x = 12 |:3
x = 4
d)2x - 1
--------- = x |*5/4
4 --
5
2x - 1 = 5/4x
2x - 5/4x = 1
3/4x = 1 |: 3/4
x = 1 1/3