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a in (-oo:+oo)
2*(a-(1/3)) = (2/5)*(a+2/3) // - (2/5)*(a+2/3)
2*(a-(1/3))-((2/5)*(a+2/3)) = 0
2*(a-1/3)+(-2/5)*(a+2/3) = 0
2*(a-1/3)-2/5*(a+2/3) = 0
2*(a-1/3)-2/5*(a+2/3) = 0
8/5*a-14/15 = 0
8/5*a-14/15 = 0
8/5*a-14/15 = 0 // + 14/15
8/5*a = 14/15 // : 8/5
a = 14/15/8/5
a = 7/12
a = 7/12
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