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x in (-oo:+oo)
(5/2)*x-4 = 7 // - 7
(5/2)*x-7-4 = 0
5/2*x-11 = 0 // + 11
5/2*x = 11 // : 5/2
x = 11/5/2
x = 22/5
x = 22/5
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