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a in (-oo:+oo)
4/9 = a/45 // - a/45
4/9-(a/45) = 0
4/9-1/45*a = 0 // - 4/9
-1/45*a = -4/9 // : -1/45
a = -4/9/(-1/45)
a = 20
a = 20
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