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a in (-oo:+oo)
(55/8)*a-27 = -7 // + 7
(55/8)*a-27+7 = 0
55/8*a-20 = 0 // + 20
55/8*a = 20 // : 55/8
a = 20/55/8
a = 32/11
a = 32/11
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