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