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a in (-oo:+oo)
-10 = (4/11)*a // - (4/11)*a
-((4/11)*a)-10 = 0
(-4/11)*a-10 = 0
-4/11*a-10 = 0 // + 10
-4/11*a = 10 // : -4/11
a = 10/(-4/11)
a = -55/2
a = -55/2
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