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a in (-oo:+oo)
10/27 = a/135 // - a/135
10/27-(a/135) = 0
10/27-1/135*a = 0 // - 10/27
-1/135*a = -10/27 // : -1/135
a = -10/27/(-1/135)
a = 50
a = 50
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