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a in (-oo:+oo)
(1/2)*a-(2*a)+2/3 = -7/3 // + -7/3
(1/2)*a-(2*a)+2/3-(-7/3) = 0
(1/2)*a-2*a+2/3+7/3 = 0
3-3/2*a = 0 // - 3
-3/2*a = -3 // : -3/2
a = -3/(-3/2)
a = 2
a = 2
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