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x in (-oo:+oo)
(5/8)*x-(1/4) = 5.5 // - 5.5
(5/8)*x-(1/4)-5.5 = 0
(5/8)*x-1/4-5.5 = 0
5/8*x-5.75 = 0 // + 5.75
5/8*x = 5.75 // : 5/8
x = 5.75/5/8
x = 9.2
x = 9.2
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