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x in (-oo:+oo)
(5/2)*x-1 = 6 // - 6
(5/2)*x-6-1 = 0
5/2*x-7 = 0 // + 7
5/2*x = 7 // : 5/2
x = 7/5/2
x = 14/5
x = 14/5
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