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a in (-oo:+oo)
a/20+4/15 = a/15 // - a/15
a/20-(a/15)+4/15 = 0
4/15-1/60*a = 0 // - 4/15
-1/60*a = -4/15 // : -1/60
a = -4/15/(-1/60)
a = 16
a = 16
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