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