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X = 25 : 3
X = 8,33
b. 3X + 4X = 35
7X = 35
X = 35 : 7
X = 5
c. 2X + 7 = 43
2X = 43 - 7
2X = 36
X = 36 : 2 = 18
d. 2/3X = 6
X = 6 X 3/2
X = 18/2
X = 9
e. 1 1/2X + 3 = 5 1/3
1 1/2X = 5 1/3 - 3
1 1/2X = 2 1/3
X = 2 1/3 : 1 1/2
X = 7/3 : 3/2
X = 7/3 X 2/3
X = 14/9
f. -X - 13 = 5
-X = 5 + 13
-X = 18
X = -18
g. 9 - 6X = 2
- 6X = 2 - 9
- 6X = -7
X = -7/-6
X = 7/6
h. 8 - 5X = X + 16
8 - 16 = X + 5X
-8 = 6X
X = -8/6
i. 17 = 23 + 2X
17 - 23 = 2X
-6 = 2X
X = -6/2
X = -3
j. 1/2X + 1/3X = 1
3/6X + 2/6X = 1
5/6X = 1
X = 1 : 5/6
X = 1 X 6/5
X = 6/5