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a in (-oo:+oo)
0 = -0.5*a-(2/3) // + -0.5*a-(2/3)
2/3-(-0.5*a)+0 = 0
0.5*a+2/3 = 0
0.5*a+2/3 = 0 // - 2/3
0.5*a = -2/3 // : 0.5
a = -2/3/0.5
a = -1.33333334
a = -1.33333334
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