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a in (-oo:+oo)
3/18 = a/30 // - a/30
3/18-(a/30) = 0
1/6-1/30*a = 0 // - 1/6
-1/30*a = -1/6 // : -1/30
a = -1/6/(-1/30)
a = 5
a = 5
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