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a in (-oo:+oo)
-((5/6)*a)-1 = (-2/3)*a-(10/9) // - (-2/3)*a-(10/9)
10/9-((5/6)*a)-((-2/3)*a)-1 = 0
(-5/6)*a+(2/3)*a+10/9-1 = 0
1/9-1/6*a = 0 // - 1/9
-1/6*a = -1/9 // : -1/6
a = -1/9/(-1/6)
a = 2/3
a = 2/3
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