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a in (-oo:+oo)
(2/3)*a+2 = 4*a+1 // - 4*a+1
(2/3)*a-(4*a)-1+2 = 0
(2/3)*a-4*a-1+2 = 0
1-10/3*a = 0 // - 1
-10/3*a = -1 // : -10/3
a = -1/(-10/3)
a = 3/10
a = 3/10
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