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a in (-oo:+oo)
(-4/5)*a-(5/9) = -37/45 // + -37/45
(-4/5)*a-(5/9)-(-37/45) = 0
(-4/5)*a-5/9+37/45 = 0
4/15-4/5*a = 0 // - 4/15
-4/5*a = -4/15 // : -4/5
a = -4/15/(-4/5)
a = 1/3
a = 1/3
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