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a in (-oo:+oo)
(2/3)*(6*a+12) = 20 // - 20
(2/3)*(6*a+12)-20 = 0
2/3*(6*a+12)-20 = 0
2/3*(6*a+12)-20 = 0
4*a-12 = 0
4*a-12 = 0
4*a-12 = 0 // + 12
4*a = 12 // : 4
a = 12/4
a = 3
a = 3
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