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a in (-oo:+oo)
(2/3)*(12*a-15) = 6 // - 6
(2/3)*(12*a-15)-6 = 0
2/3*(12*a-15)-6 = 0
2/3*(12*a-15)-6 = 0
8*a-16 = 0
8*a-16 = 0
8*a-16 = 0 // + 16
8*a = 16 // : 8
a = 16/8
a = 2
a = 2
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