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