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a in (-oo:+oo)
-10 = (5/6)*a // - (5/6)*a
-((5/6)*a)-10 = 0
(-5/6)*a-10 = 0
-5/6*a-10 = 0 // + 10
-5/6*a = 10 // : -5/6
a = 10/(-5/6)
a = -12
a = -12
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