2/3 * ( 1/3X - 1/2 ) = 4X + 2 1/2
2/9X - 1/3 = 4X + 5/2
общий знаменатель 18
4Х - 6 = 72Х + 45
- 68Х = 51
Х = - 51/68
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5/6 * ( 1/3X - 1/5) = 3X + 3 1/3
5/18X - 1/6 = 3X + 10/3
общий знаменатель 18
5Х - 3 = 54Х + 60
54Х - 5Х = - 63
49Х = - 63
Х = - 63/49 = - 9/7 = - 1 2/7