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a in (-oo:+oo)
1/9 = (-2/3)*a+(1/2)*a+7/9 // - (-2/3)*a+(1/2)*a+7/9
1/9-((-2/3)*a)-((1/2)*a)-(7/9) = 0
(2/3)*a+(-1/2)*a+1/9-7/9 = 0
1/6*a-2/3 = 0 // + 2/3
1/6*a = 2/3 // : 1/6
a = 2/3/1/6
a = 4
a = 4
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