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a in (-oo:+oo)
(2/3)*a-(5/6) = (1/2)*a-4 // - (1/2)*a-4
(2/3)*a-((1/2)*a)-(5/6)+4 = 0
(2/3)*a+(-1/2)*a-5/6+4 = 0
1/6*a+19/6 = 0 // - 19/6
1/6*a = -19/6 // : 1/6
a = -19/6/1/6
a = -19
a = -19
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