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a in (-oo:+oo)
30/15 = (1/15)*a // - (1/15)*a
30/15-((1/15)*a) = 0
(-1/15)*a+30/15 = 0
2-1/15*a = 0 // - 2
-1/15*a = -2 // : -1/15
a = -2/(-1/15)
a = 30
a = 30
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