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2014-09-21T17:07:01+03:00
A : (3a - 2) : 2 + 15 = 20
a : (3a - 2) : 2 = 5
a : (3a - 2) = 10
a = 10 * (3a - 2)
a = 30 a - 20
- 29a = - 20
a = 20/29
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2014-09-21T17:09:44+03:00
a:[(a*3-2):2+15]:4=5
a:[(a*3-2):2+15=20

(a*3-2):2+15=20:a
(3a-2)x10=a
30a-20=a
29a=20
a= \frac{20}{29}

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