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a in (-oo:+oo)
-((4/9)*a)-1/5 = 2/15 // - 2/15
-((4/9)*a)-1/5-(2/15) = 0
(-4/9)*a-1/5-2/15 = 0
-4/9*a-1/3 = 0 // + 1/3
-4/9*a = 1/3 // : -4/9
a = 1/3/(-4/9)
a = -3/4
a = -3/4
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