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a in (-oo:+oo)
(2/3)*a = 12-4 // - 12-4
(2/3)*a-12+4 = 0
2/3*a-8 = 0 // + 8
2/3*a = 8 // : 2/3
a = 8/2/3
a = 12
a = 12
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