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x in (-oo:+oo)
(5/2)*x = 17.5 // - 17.5
(5/2)*x-17.5 = 0
5/2*x-17.5 = 0 // + 17.5
5/2*x = 17.5 // : 5/2
x = 17.5/5/2
x = 7
x = 7
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