a) 2x + 5 = 19
2x = 19 - 5
2x = 14/:2
x = 7
b) 7x - 5 = x + 9
7x - x = 9 + 5
6x = 14/:6
x = 14/6
x = 2 2/6
c) 4x + x + (6 + 3x) = 3(x - 1)
8x + 6 = 3x - 3
5x = -3 - 6
5x = -9/:5
x = -1 4/5
d) 7 - 2x = (16 + x) - (3x+9)
7 - 2x = 16 + x -3x - 9
7 - 2x = -2x + 7
7-7 = -2x + 2x
0=0
e) x - 5x +1/4 = 1/5 / razy 20
20x - 5(5x + 1) = 4
20x - 25x - 5 = 4
-5x = 4 +5
-5x = 9/: (-5)
x = -1 4/5
