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a in (-oo:+oo)
(3*(a+6))/2 = 24 // - 24
(3*(a+6))/2-24 = 0
(3*(a+6))/2+(-24*2)/2 = 0
3*(a+6)-24*2 = 0
3*a-30 = 0
(3*a-30)/2 = 0
(3*a-30)/2 = 0 // * 2
3*a-30 = 0
3*a-30 = 0 // + 30
3*a = 30 // : 3
a = 30/3
a = 10
a = 10
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