daca 2(x-a) +3 = a/2 |*2 => 4x - 4a + 3 = a => 4x - 5a = - 3
si x/3 - 1 = a |*3 => x - 3a = 3 |*(-4)
4x - 5a = -3
- 4x +12a= - 12
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7a = -15 deci a= - 15/7
iar x / 3 = -15/7 +1
x / 3 = -8 / 7 => x = -8*3:7 => x = -24/7
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