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a in (-oo:+oo)
(2/3)*a-4 = (1/3)*a // - (1/3)*a
(2/3)*a-((1/3)*a)-4 = 0
(2/3)*a+(-1/3)*a-4 = 0
1/3*a-4 = 0 // + 4
1/3*a = 4 // : 1/3
a = 4/1/3
a = 12
a = 12
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