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a in (-oo:+oo)
2/18 = a/180 // - a/180
2/18-(a/180) = 0
1/9-1/180*a = 0 // - 1/9
-1/180*a = -1/9 // : -1/180
a = -1/9/(-1/180)
a = 20
a = 20
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