a, x : 4 1/3 = -2,5
x : 13/3 = -2,5
x = -2,5 x 13/3
x = -65/6
d, -2/3 - 1/3(2x - 5) = 3/2
1/3(2x - 5) = 3/2 + -2/3 = 5/6
2x - 5 = 5/6 : 1/3 = 5/2
2x = 5/2 + 5 = 15/2
x = 15/2 : 2 = 15/4
e, 2/3 + 1/3 : x = 2
1/3 : x = 2 - 2/3 = 4/3
x = 4/3 x 1/3 = 4/9
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