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x in (-oo:+oo)
(3/8)*x+x = 5.5 // - 5.5
(3/8)*x+x-5.5 = 0
11/8*x-5.5 = 0 // + 5.5
11/8*x = 5.5 // : 11/8
x = 5.5/11/8
x = 4
x = 4
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